frp

frp

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What is frp?

frp is a fast reverse proxy that allows you to expose a local server located behind a NAT or firewall to the Internet. It currently supports TCP and UDP, as well as HTTP and HTTPS protocols, enabling requests to be forwarded to internal services via domain name.

frp also offers a P2P connect mode.

Table of Contents

• Development Status
  • About V2
• Architecture
• Example Usage
  • Access your computer in a LAN network via SSH
  • Multiple SSH services sharing the same port
  • Accessing Internal Web Services with Custom Domains in LAN
  • Forward DNS query requests
  • Forward Unix Domain Socket
  • Expose a simple HTTP file server
  • Enable HTTPS for a local HTTP(S) service
  • Expose your service privately
  • P2P Mode
• Features
  • Configuration Files
  • Using Environment Variables
  • Split Configures Into Different Files
  • Server Dashboard
  • Client Admin UI
    • Dynamic Proxy Management (Store)
  • Monitor
    • Prometheus
  • Authenticating the Client
    • Token Authentication
    • OIDC Authentication
  • Encryption and Compression
    • TLS
  • Hot-Reloading frpc configuration
  • Get proxy status from client
  • Only allowing certain ports on the server
  • Port Reuse
  • Bandwidth Limit
    • For Each Proxy
  • TCP Stream Multiplexing
  • Support KCP Protocol
  • Support QUIC Protocol
  • Connection Pooling
  • Load balancing
  • Service Health Check
  • Rewriting the HTTP Host Header
  • Setting other HTTP Headers
  • Get Real IP
    • HTTP X-Forwarded-For
    • Proxy Protocol
  • Require HTTP Basic Auth (Password) for Web Services
  • Custom Subdomain Names
  • URL Routing
  • TCP Port Multiplexing
  • Connecting to frps via PROXY
  • Port range mapping
  • Client Plugins
  • Server Manage Plugins
  • SSH Tunnel Gateway
  • Virtual Network (VirtualNet)
• Feature Gates
  • Available Feature Gates
  • Enabling Feature Gates
  • Feature Lifecycle
• Related Projects
• Contributing
• Donation
  • GitHub Sponsors
  • PayPal

Development Status

frp is currently under development. You can try the latest release version in the master branch, or use the dev branch to access the version currently in development.

We are currently working on version 2 and attempting to perform some code refactoring and improvements. However, please note that it will not be compatible with version 1.

We will transition from version 0 to version 1 at the appropriate time and will only accept bug fixes and improvements, rather than big feature requests.

About V2

The complexity and difficulty of the v2 version are much higher than anticipated. I can only work on its development during fragmented time periods, and the constant interruptions disrupt productivity significantly. Given this situation, we will continue to optimize and iterate on the current version until we have more free time to proceed with the major version overhaul.

The concept behind v2 is based on my years of experience and reflection in the cloud-native domain, particularly in K8s and ServiceMesh. Its core is a modernized four-layer and seven-layer proxy, similar to envoy. This proxy itself is highly scalable, not only capable of implementing the functionality of intranet penetration but also applicable to various other domains. Building upon this highly scalable core, we aim to implement all the capabilities of frp v1 while also addressing the functionalities that were previously unachievable or difficult to implement in an elegant manner. Furthermore, we will maintain efficient development and iteration capabilities.

In addition, I envision frp itself becoming a highly extensible system and platform, similar to how we can provide a range of extension capabilities based on K8s. In K8s, we can customize development according to enterprise needs, utilizing features such as CRD, controller mode, webhook, CSI, and CNI. In frp v1, we introduced the concept of server plugins, which implemented some basic extensibility. However, it relies on a simple HTTP protocol and requires users to start independent processes and manage them on their own. This approach is far from flexible and convenient, and real-world demands vary greatly. It is unrealistic to expect a non-profit open-source project maintained by a few individuals to meet everyone's needs.

Finally, we acknowledge that the current design of modules such as configuration management, permission verification, certificate management, and API management is not modern enough. While we may carry out some optimizations in the v1 version, ensuring compatibility remains a challenging issue that requires a considerable amount of effort to address.

We sincerely appreciate your support for frp.

Architecture

Example Usage

To begin, download the latest program for your operating system and architecture from the Release page.

Next, place the frps binary and server configuration file on Server A, which has a public IP address.

Finally, place the frpc binary and client configuration file on Server B, which is located on a LAN that cannot be directly accessed from the public internet.

Some antiviruses improperly mark frpc as malware and delete it. This is due to frp being a networking tool capable of creating reverse proxies. Antiviruses sometimes flag reverse proxies due to their ability to bypass firewall port restrictions. If you are using antivirus, then you may need to whitelist/exclude frpc in your antivirus settings to avoid accidental quarantine/deletion. See issue 3637 for more details.

Access your computer in a LAN network via SSH

1. Modify frps.toml on server A by setting the bindPort for frp clients to connect to:

# frps.toml
bindPort = 7000

2. Start frps on server A:

./frps -c ./frps.toml

3. Modify frpc.toml on server B and set the serverAddr field to the public IP address of your frps server:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "ssh"
type = "tcp"
localIP = "127.0.0.1"
localPort = 22
remotePort = 6000

Note that the localPort (listened on the client) and remotePort (exposed on the server) are used for traffic going in and out of the frp system, while the serverPort is used for communication between frps and frpc.

4. Start frpc on server B:

./frpc -c ./frpc.toml

5. To access server B from another machine through server A via SSH (assuming the username is test), use the following command:

ssh -oPort=6000 [email protected]

Multiple SSH services sharing the same port

This example implements multiple SSH services exposed through the same port using a proxy of type tcpmux. Similarly, as long as the client supports the HTTP Connect proxy connection method, port reuse can be achieved in this way.

1. Deploy frps on a machine with a public IP and modify the frps.toml file. Here is a simplified configuration:

bindPort = 7000
tcpmuxHTTPConnectPort = 5002

2. Deploy frpc on the internal machine A with the following configuration:

serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "ssh1"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["machine-a.example.com"]
localIP = "127.0.0.1"
localPort = 22

3. Deploy another frpc on the internal machine B with the following configuration:

serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "ssh2"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["machine-b.example.com"]
localIP = "127.0.0.1"
localPort = 22

4. To access internal machine A using SSH ProxyCommand, assuming the username is "test":

ssh -o 'proxycommand socat - PROXY:x.x.x.x:%h:%p,proxyport=5002' [email protected]

5. To access internal machine B, the only difference is the domain name, assuming the username is "test":

ssh -o 'proxycommand socat - PROXY:x.x.x.x:%h:%p,proxyport=5002' [email protected]

Accessing Internal Web Services with Custom Domains in LAN

Sometimes we need to expose a local web service behind a NAT network to others for testing purposes with our own domain name.

Unfortunately, we cannot resolve a domain name to a local IP. However, we can use frp to expose an HTTP(S) service.

1. Modify frps.toml and set the HTTP port for vhost to 8080:

# frps.toml
bindPort = 7000
vhostHTTPPort = 8080

If you want to configure an https proxy, you need to set up the vhostHTTPSPort.

2. Start frps:

./frps -c ./frps.toml

3. Modify frpc.toml and set serverAddr to the IP address of the remote frps server. Specify the localPort of your web service:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "web"
type = "http"
localPort = 80
customDomains = ["www.example.com"]

4. Start frpc:

./frpc -c ./frpc.toml

5. Map the A record of www.example.com to either the public IP of the remote frps server or a CNAME record pointing to your original domain.

6. Visit your local web service using url http://www.example.com:8080.

Forward DNS query requests

1. Modify frps.toml:

# frps.toml
bindPort = 7000

2. Start frps:

./frps -c ./frps.toml

3. Modify frpc.toml and set serverAddr to the IP address of the remote frps server. Forward DNS query requests to the Google Public DNS server 8.8.8.8:53:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "dns"
type = "udp"
localIP = "8.8.8.8"
localPort = 53
remotePort = 6000

4. Start frpc:

./frpc -c ./frpc.toml

5. Test DNS resolution using the dig command:

dig @x.x.x.x -p 6000 www.google.com

Forward Unix Domain Socket

Expose a Unix domain socket (e.g. the Docker daemon socket) as TCP.

Configure frps as above.

1. Start frpc with the following configuration:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "unix_domain_socket"
type = "tcp"
remotePort = 6000
[proxies.plugin]
type = "unix_domain_socket"
unixPath = "/var/run/docker.sock"

2. Test the configuration by getting the docker version using curl:

curl http://x.x.x.x:6000/version

Expose a simple HTTP file server

Expose a simple HTTP file server to access files stored in the LAN from the public Internet.

Configure frps as described above, then:

1. Start frpc with the following configuration:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "test_static_file"
type = "tcp"
remotePort = 6000
[proxies.plugin]
type = "static_file"
localPath = "/tmp/files"
stripPrefix = "static"
httpUser = "abc"
httpPassword = "abc"

2. Visit http://x.x.x.x:6000/static/ from your browser and specify correct username and password to view files in /tmp/files on the frpc machine.

Enable HTTPS for a local HTTP(S) service

You may substitute https2https for the plugin, and point the localAddr to a HTTPS endpoint.

1. Start frpc with the following configuration:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "test_https2http"
type = "https"
customDomains = ["test.example.com"]

[proxies.plugin]
type = "https2http"
localAddr = "127.0.0.1:80"
crtPath = "./server.crt"
keyPath = "./server.key"
hostHeaderRewrite = "127.0.0.1"
requestHeaders.set.x-from-where = "frp"

2. Visit https://test.example.com.

Expose your service privately

To mitigate risks associated with exposing certain services directly to the public network, STCP (Secret TCP) mode requires a preshared key to be used for access to the service from other clients.

Configure frps same as above.

1. Start frpc on machine B with the following config. This example is for exposing the SSH service (port 22), and note the secretKey field for the preshared key, and that the remotePort field is removed here:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "secret_ssh"
type = "stcp"
secretKey = "abcdefg"
localIP = "127.0.0.1"
localPort = 22

2. Start another frpc (typically on another machine C) with the following config to access the SSH service with a security key (secretKey field):

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[visitors]]
name = "secret_ssh_visitor"
type = "stcp"
serverName = "secret_ssh"
secretKey = "abcdefg"
bindAddr = "127.0.0.1"
bindPort = 6000

3. On machine C, connect to SSH on machine B, using this command:

ssh -oPort=6000 127.0.0.1

P2P Mode

xtcp is designed to transmit large amounts of data directly between clients. A frps server is still needed, as P2P here only refers to the actual data transmission.

Note that it may not work with all types of NAT devices. You might want to fallback to stcp if xtcp doesn't work.

1. Start frpc on machine B, and expose the SSH port. Note that the remotePort field is removed:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000
# set up a new stun server if the default one is not available.
# natHoleStunServer = "xxx"

[[proxies]]
name = "p2p_ssh"
type = "xtcp"
secretKey = "abcdefg"
localIP = "127.0.0.1"
localPort = 22

2. Start another frpc (typically on another machine C) with the configuration to connect to SSH using P2P mode:

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000
# set up a new stun server if the default one is not available.
# natHoleStunServer = "xxx"

[[visitors]]
name = "p2p_ssh_visitor"
type = "xtcp"
serverName = "p2p_ssh"
secretKey = "abcdefg"
bindAddr = "127.0.0.1"
bindPort = 6000
# when automatic tunnel persistence is required, set it to true
keepTunnelOpen = false

3. On machine C, connect to SSH on machine B, using this command:

ssh -oPort=6000 127.0.0.1

Features

Configuration Files

Since v0.52.0, we support TOML, YAML, and JSON for configuration. Please note that INI is deprecated and will be removed in future releases. New features will only be available in TOML, YAML, or JSON. Users wanting these new features should switch their configuration format accordingly.

Read the full example configuration files to find out even more features not described here.

Examples use TOML format, but you can still use YAML or JSON.

These configuration files is for reference only. Please do not use this configuration directly to run the program as it may have various issues.

Full configuration file for frps (Server)

Full configuration file for frpc (Client)

Using Environment Variables

Environment variables can be referenced in the configuration file, using Go's standard format:

# frpc.toml
serverAddr = "{{ .Envs.FRP_SERVER_ADDR }}"
serverPort = 7000

[[proxies]]
name = "ssh"
type = "tcp"
localIP = "127.0.0.1"
localPort = 22
remotePort = {{ .Envs.FRP_SSH_REMOTE_PORT }}

With the config above, variables can be passed into frpc program like this:

export FRP_SERVER_ADDR=x.x.x.x
export FRP_SSH_REMOTE_PORT=6000
./frpc -c ./frpc.toml

frpc will render configuration file template using OS environment variables. Remember to prefix your reference with .Envs.

Split Configures Into Different Files

You can split multiple proxy configs into different files and include them in the main file.

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000
includes = ["./confd/*.toml"]

# ./confd/test.toml

[[proxies]]
name = "ssh"
type = "tcp"
localIP = "127.0.0.1"
localPort = 22
remotePort = 6000

Server Dashboard

Check frp's status and proxies' statistics information by Dashboard.

Configure a port for dashboard to enable this feature:

# The default value is 127.0.0.1. Change it to 0.0.0.0 when you want to access it from a public network.
webServer.addr = "0.0.0.0"
webServer.port = 7500
# dashboard's username and password are both optional
webServer.user = "admin"
webServer.password = "admin"

Then visit http://[serverAddr]:7500 to see the dashboard, with username and password both being admin.

Additionally, you can use HTTPS port by using your domains wildcard or normal SSL certificate:

webServer.port = 7500
# dashboard's username and password are both optional
webServer.user = "admin"
webServer.password = "admin"
webServer.tls.certFile = "server.crt"
webServer.tls.keyFile = "server.key"

Then visit https://[serverAddr]:7500 to see the dashboard in secure HTTPS connection, with username and password both being admin.

Client Admin UI

The Client Admin UI helps you check and manage frpc's configuration and proxies.

Configure an address for admin UI to enable this feature:

webServer.addr = "127.0.0.1"
webServer.port = 7400
webServer.user = "admin"
webServer.password = "admin"

Then visit http://127.0.0.1:7400 to see admin UI, with username and password both being admin.

Dynamic Proxy Management (Store)

You can dynamically create, update, and delete proxies and visitors at runtime through the Web UI or API, without restarting frpc.

To enable this feature, configure store.path to specify a file for persisting the configurations:

[store]
path = "./db.json"

Proxies and visitors managed through the Store are saved to disk and automatically restored on frpc restart. They work alongside proxies defined in the configuration file — Store entries take precedence when names conflict.

Monitor

When web server is enabled, frps will save monitor data in cache for 7 days. It will be cleared after process restart.

Prometheus is also supported.

Prometheus

Enable dashboard first, then configure enablePrometheus = true in frps.toml.

http://{dashboard_addr}/metrics will provide prometheus monitor data.

Authenticating the Client

There are 2 authentication methods to authenticate frpc with frps.

You can decide which one to use by configuring auth.method in frpc.toml and frps.toml, the default one is token.

Configuring auth.additionalScopes = ["HeartBeats"] will use the configured authentication method to add and validate authentication on every heartbeat between frpc and frps.

Configuring auth.additionalScopes = ["NewWorkConns"] will do the same for every new work connection between frpc and frps.

Token Authentication

When specifying auth.method = "token" in frpc.toml and frps.toml - token based authentication will be used.

Make sure to specify the same auth.token in frps.toml and frpc.toml for frpc to pass frps validation

Token Source

frp supports reading authentication tokens from external sources using the tokenSource configuration. Currently, file-based token source is supported.

File-based token source:

# frpc.toml
auth.method = "token"
auth.tokenSource.type = "file"
auth.tokenSource.file.path = "/path/to/token/file"

The token will be read from the specified file at startup. This is useful for scenarios where tokens are managed by external systems or need to be kept separate from configuration files for security reasons.

OIDC Authentication

When specifying auth.method = "oidc" in frpc.toml and frps.toml - OIDC based authentication will be used.

OIDC stands for OpenID Connect, and the flow used is called Client Credentials Grant.

To use this authentication type - configure frpc.toml and frps.toml as follows:

# frps.toml
auth.method = "oidc"
auth.oidc.issuer = "https://example-oidc-issuer.com/"
auth.oidc.audience = "https://oidc-audience.com/.default"

# frpc.toml
auth.method = "oidc"
auth.oidc.clientID = "98692467-37de-409a-9fac-bb2585826f18" # Replace with OIDC client ID
auth.oidc.clientSecret = "oidc_secret"
auth.oidc.audience = "https://oidc-audience.com/.default"
auth.oidc.tokenEndpointURL = "https://example-oidc-endpoint.com/oauth2/v2.0/token"

Encryption and Compression

The features are off by default. You can turn on encryption and/or compression:

# frpc.toml

[[proxies]]
name = "ssh"
type = "tcp"
localPort = 22
remotePort = 6000
transport.useEncryption = true
transport.useCompression = true

TLS

Since v0.50.0, the default value of transport.tls.enable and transport.tls.disableCustomTLSFirstByte has been changed to true, and tls is enabled by default.

For port multiplexing, frp sends a first byte 0x17 to dial a TLS connection. This only takes effect when you set transport.tls.disableCustomTLSFirstByte to false.

To enforce frps to only accept TLS connections - configure transport.tls.force = true in frps.toml. This is optional.

frpc TLS settings:

transport.tls.enable = true
transport.tls.certFile = "certificate.crt"
transport.tls.keyFile = "certificate.key"
transport.tls.trustedCaFile = "ca.crt"

frps TLS settings:

transport.tls.force = true
transport.tls.certFile = "certificate.crt"
transport.tls.keyFile = "certificate.key"
transport.tls.trustedCaFile = "ca.crt"

You will need a root CA cert and at least one SSL/TLS certificate. It can be self-signed or regular (such as Let's Encrypt or another SSL/TLS certificate provider).

If you using frp via IP address and not hostname, make sure to set the appropriate IP address in the Subject Alternative Name (SAN) area when generating SSL/TLS Certificates.

Given an example:

• Prepare openssl config file. It exists at /etc/pki/tls/openssl.cnf in Linux System and /System/Library/OpenSSL/openssl.cnf in MacOS, and you can copy it to current path, like cp /etc/pki/tls/openssl.cnf ./my-openssl.cnf. If not, you can build it by yourself, like:

cat > my-openssl.cnf << EOF
[ ca ]
default_ca = CA_default
[ CA_default ]
x509_extensions = usr_cert
[ req ]
default_bits        = 2048
default_md          = sha256
default_keyfile     = privkey.pem
distinguished_name  = req_distinguished_name
attributes          = req_attributes
x509_extensions     = v3_ca
string_mask         = utf8only
[ req_distinguished_name ]
[ req_attributes ]
[ usr_cert ]
basicConstraints       = CA:FALSE
nsComment              = "OpenSSL Generated Certificate"
subjectKeyIdentifier   = hash
authorityKeyIdentifier = keyid,issuer
[ v3_ca ]
subjectKeyIdentifier   = hash
authorityKeyIdentifier = keyid:always,issuer
basicConstraints       = CA:true
EOF

• build ca certificates:

openssl genrsa -out ca.key 2048
openssl req -x509 -new -nodes -key ca.key -subj "/CN=example.ca.com" -days 5000 -out ca.crt

• build frps certificates:

openssl genrsa -out server.key 2048

openssl req -new -sha256 -key server.key \
    -subj "/C=XX/ST=DEFAULT/L=DEFAULT/O=DEFAULT/CN=server.com" \
    -reqexts SAN \
    -config <(cat my-openssl.cnf <(printf "\n[SAN]\nsubjectAltName=DNS:localhost,IP:127.0.0.1,DNS:example.server.com")) \
    -out server.csr

openssl x509 -req -days 365 -sha256 \
	-in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial \
	-extfile <(printf "subjectAltName=DNS:localhost,IP:127.0.0.1,DNS:example.server.com") \
	-out server.crt

• build frpc certificates：

openssl genrsa -out client.key 2048
openssl req -new -sha256 -key client.key \
    -subj "/C=XX/ST=DEFAULT/L=DEFAULT/O=DEFAULT/CN=client.com" \
    -reqexts SAN \
    -config <(cat my-openssl.cnf <(printf "\n[SAN]\nsubjectAltName=DNS:client.com,DNS:example.client.com")) \
    -out client.csr

openssl x509 -req -days 365 -sha256 \
    -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial \
	-extfile <(printf "subjectAltName=DNS:client.com,DNS:example.client.com") \
	-out client.crt

Hot-Reloading frpc configuration

The webServer fields are required for enabling HTTP API:

# frpc.toml
webServer.addr = "127.0.0.1"
webServer.port = 7400

Then run command frpc reload -c ./frpc.toml and wait for about 10 seconds to let frpc create or update or remove proxies.

Note that global client parameters won't be modified except 'start'.

start is a global allowlist evaluated after all sources are merged (config file/include/store).
If start is non-empty, any proxy or visitor not listed there will not be started, including
entries created via Store API.

start is kept mainly for compatibility and is generally not recommended for new configurations.
Prefer per-proxy/per-visitor enabled, and keep start empty unless you explicitly want this
global allowlist behavior.

You can run command frpc verify -c ./frpc.toml before reloading to check if there are config errors.

Get proxy status from client

Use frpc status -c ./frpc.toml to get status of all proxies. The webServer fields are required for enabling HTTP API.

Only allowing certain ports on the server

allowPorts in frps.toml is used to avoid abuse of ports:

# frps.toml
allowPorts = [
  { start = 2000, end = 3000 },
  { single = 3001 },
  { single = 3003 },
  { start = 4000, end = 50000 }
]

Port Reuse

vhostHTTPPort and vhostHTTPSPort in frps can use same port with bindPort. frps will detect the connection's protocol and handle it correspondingly.

What you need to pay attention to is that if you want to configure vhostHTTPSPort and bindPort to the same port, you need to first set transport.tls.disableCustomTLSFirstByte to false.

We would like to try to allow multiple proxies bind a same remote port with different protocols in the future.

Bandwidth Limit

For Each Proxy

# frpc.toml

[[proxies]]
name = "ssh"
type = "tcp"
localPort = 22
remotePort = 6000
transport.bandwidthLimit = "1MB"

Set transport.bandwidthLimit in each proxy's configure to enable this feature. Supported units are MB and KB.

Set transport.bandwidthLimitMode to client or server to limit bandwidth on the client or server side. Default is client.

TCP Stream Multiplexing

frp supports tcp stream multiplexing since v0.10.0 like HTTP2 Multiplexing, in which case all logic connections to the same frpc are multiplexed into the same TCP connection.

You can disable this feature by modify frps.toml and frpc.toml:

# frps.toml and frpc.toml, must be same
transport.tcpMux = false

Support KCP Protocol

KCP is a fast and reliable protocol that can achieve the transmission effect of a reduction of the average latency by 30% to 40% and reduction of the maximum delay by a factor of three, at the cost of 10% to 20% more bandwidth wasted than TCP.

KCP mode uses UDP as the underlying transport. Using KCP in frp:

1. Enable KCP in frps:

# frps.toml
bindPort = 7000
# Specify a UDP port for KCP.
kcpBindPort = 7000

The kcpBindPort number can be the same number as bindPort, since bindPort field specifies a TCP port.

2. Configure frpc.toml to use KCP to connect to frps:

# frpc.toml
serverAddr = "x.x.x.x"
# Same as the 'kcpBindPort' in frps.toml
serverPort = 7000
transport.protocol = "kcp"

Support QUIC Protocol

QUIC is a new multiplexed transport built on top of UDP.

Using QUIC in frp:

1. Enable QUIC in frps:

# frps.toml
bindPort = 7000
# Specify a UDP port for QUIC.
quicBindPort = 7000

The quicBindPort number can be the same number as bindPort, since bindPort field specifies a TCP port.

2. Configure frpc.toml to use QUIC to connect to frps:

# frpc.toml
serverAddr = "x.x.x.x"
# Same as the 'quicBindPort' in frps.toml
serverPort = 7000
transport.protocol = "quic"

Connection Pooling

By default, frps creates a new frpc connection to the backend service upon a user request. With connection pooling, frps keeps a certain number of pre-established connections, reducing the time needed to establish a connection.

This feature is suitable for a large number of short connections.

1. Configure the limit of pool count each proxy can use in frps.toml:

# frps.toml
transport.maxPoolCount = 5

2. Enable and specify the number of connection pool:

# frpc.toml
transport.poolCount = 1

Load balancing

Load balancing is supported by group.

This feature is only available for types tcp, http, tcpmux now.

# frpc.toml

[[proxies]]
name = "test1"
type = "tcp"
localPort = 8080
remotePort = 80
loadBalancer.group = "web"
loadBalancer.groupKey = "123"

[[proxies]]
name = "test2"
type = "tcp"
localPort = 8081
remotePort = 80
loadBalancer.group = "web"
loadBalancer.groupKey = "123"

loadBalancer.groupKey is used for authentication.

Connections to port 80 will be dispatched to proxies in the same group randomly.

For type tcp, remotePort in the same group should be the same.

For type http, customDomains, subdomain, locations should be the same.

Service Health Check

Health check feature can help you achieve high availability with load balancing.

Add healthCheck.type = "tcp" or healthCheck.type = "http" to enable health check.

With health check type tcp, the service port will be pinged (TCPing):

# frpc.toml

[[proxies]]
name = "test1"
type = "tcp"
localPort = 22
remotePort = 6000
# Enable TCP health check
healthCheck.type = "tcp"
# TCPing timeout seconds
healthCheck.timeoutSeconds = 3
# If health check failed 3 times in a row, the proxy will be removed from frps
healthCheck.maxFailed = 3
# A health check every 10 seconds
healthCheck.intervalSeconds = 10

With health check type http, an HTTP request will be sent to the service and an HTTP 2xx OK response is expected:

# frpc.toml

[[proxies]]
name = "web"
type = "http"
localIP = "127.0.0.1"
localPort = 80
customDomains = ["test.example.com"]
# Enable HTTP health check
healthCheck.type = "http"
# frpc will send a GET request to '/status'
# and expect an HTTP 2xx OK response
healthCheck.path = "/status"
healthCheck.timeoutSeconds = 3
healthCheck.maxFailed = 3
healthCheck.intervalSeconds = 10

Rewriting the HTTP Host Header

By default frp does not modify the tunneled HTTP requests at all as it's a byte-for-byte copy.

However, speaking of web servers and HTTP requests, your web server might rely on the Host HTTP header to determine the website to be accessed. frp can rewrite the Host header when forwarding the HTTP requests, with the hostHeaderRewrite field:

# frpc.toml

[[proxies]]
name = "web"
type = "http"
localPort = 80
customDomains = ["test.example.com"]
hostHeaderRewrite = "dev.example.com"

The HTTP request will have the Host header rewritten to Host: dev.example.com when it reaches the actual web server, although the request from the browser probably has Host: test.example.com.

Setting other HTTP Headers

Similar to Host, You can override other HTTP request and response headers with proxy type http.

# frpc.toml

[[proxies]]
name = "web"
type = "http"
localPort = 80
customDomains = ["test.example.com"]
hostHeaderRewrite = "dev.example.com"
requestHeaders.set.x-from-where = "frp"
responseHeaders.set.foo = "bar"

In this example, it will set header x-from-where: frp in the HTTP request and foo: bar in the HTTP response.

Get Real IP

HTTP X-Forwarded-For

This feature is for http proxies or proxies with the https2http and https2https plugins enabled.

You can get user's real IP from HTTP request headers X-Forwarded-For.

Proxy Protocol

frp supports Proxy Protocol to send user's real IP to local services.

Here is an example for https service:

# frpc.toml

[[proxies]]
name = "web"
type = "https"
localPort = 443
customDomains = ["test.example.com"]

# now v1 and v2 are supported
transport.proxyProtocolVersion = "v2"

You can enable Proxy Protocol support in nginx to expose user's real IP in HTTP header X-Real-IP, and then read X-Real-IP header in your web service for the real IP.

Require HTTP Basic Auth (Password) for Web Services

Anyone who can guess your tunnel URL can access your local web server unless you protect it with a password.

This enforces HTTP Basic Auth on all requests with the username and password specified in frpc's configure file.

It can only be enabled when proxy type is http.

# frpc.toml

[[proxies]]
name = "web"
type = "http"
localPort = 80
customDomains = ["test.example.com"]
httpUser = "abc"
httpPassword = "abc"

Visit http://test.example.com in the browser and now you are prompted to enter the username and password.

Custom Subdomain Names

It is convenient to use subdomain configure for http and https types when many people share one frps server.

# frps.toml
subDomainHost = "frps.com"

Resolve *.frps.com to the frps server's IP. This is usually called a Wildcard DNS record.

# frpc.toml

[[proxies]]
name = "web"
type = "http"
localPort = 80
subdomain = "test"

Now you can visit your web service on test.frps.com.

Note that if subdomainHost is not empty, customDomains should not be the subdomain of subdomainHost.

URL Routing

frp supports forwarding HTTP requests to different backend web services by url routing.

locations specifies the prefix of URL used for routing. frps first searches for the most specific prefix location given by literal strings regardless of the listed order.

# frpc.toml

[[proxies]]
name = "web01"
type = "http"
localPort = 80
customDomains = ["web.example.com"]
locations = ["/"]

[[proxies]]
name = "web02"
type = "http"
localPort = 81
customDomains = ["web.example.com"]
locations = ["/news", "/about"]

HTTP requests with URL prefix /news or /about will be forwarded to web02 and other requests to web01.

TCP Port Multiplexing

frp supports receiving TCP sockets directed to different proxies on a single port on frps, similar to vhostHTTPPort and vhostHTTPSPort.

The only supported TCP port multiplexing method available at the moment is httpconnect - HTTP CONNECT tunnel.

When setting tcpmuxHTTPConnectPort to anything other than 0 in frps, frps will listen on this port for HTTP CONNECT requests.

The host of the HTTP CONNECT request will be used to match the proxy in frps. Proxy hosts can be configured in frpc by configuring customDomains and / or subdomain under tcpmux proxies, when multiplexer = "httpconnect".

For example:

# frps.toml
bindPort = 7000
tcpmuxHTTPConnectPort = 1337

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "proxy1"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["test1"]
localPort = 80

[[proxies]]
name = "proxy2"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["test2"]
localPort = 8080

In the above configuration - frps can be contacted on port 1337 with a HTTP CONNECT header such as:

CONNECT test1 HTTP/1.1\r\n\r\n

and the connection will be routed to proxy1.

Connecting to frps via PROXY

frpc can connect to frps through proxy if you set OS environment variable HTTP_PROXY, or if transport.proxyURL is set in frpc.toml file.

It only works when protocol is tcp.

# frpc.toml
serverAddr = "x.x.x.x"
serverPort = 7000
transport.proxyURL = "http://user:[email protected]:8080"

Port range mapping

Added in v0.56.0

We can use the range syntax of Go template combined with the built-in parseNumberRangePair function to achieve port range mapping.

The following example, when run, will create 8 proxies named test-6000, test-6001 ... test-6007, each mapping the remote port to the local port.

{{- range $_, $v := parseNumberRangePair "6000-6006,6007" "6000-6006,6007" }}
[[proxies]]
name = "tcp-{{ $v.First }}"
type = "tcp"
localPort = {{ $v.First }}
remotePort = {{ $v.Second }}
{{- end }}

Client Plugins

frpc only forwards requests to local TCP or UDP ports by default.

Plugins are used for providing rich features. There are built-in plugins such as unix_domain_socket, http_proxy, socks5, static_file, http2https, https2http, https2https and you can see example usage.

Using plugin http_proxy:

# frpc.toml

[[proxies]]
name = "http_proxy"
type = "tcp"
remotePort = 6000
[proxies.plugin]
type = "http_proxy"
httpUser = "abc"
httpPassword = "abc"

httpUser and httpPassword are configuration parameters used in http_proxy plugin.

Server Manage Plugins

Read the document.

Find more plugins in gofrp/plugin.

SSH Tunnel Gateway

added in v0.53.0

frp supports listening to an SSH port on the frps side and achieves TCP protocol proxying through the SSH -R protocol, without relying on frpc.

# frps.toml
sshTunnelGateway.bindPort = 2200

When running ./frps -c frps.toml, a private key file named .autogen_ssh_key will be automatically created in the current working directory. This generated private key file will be used by the SSH server in frps.

Executing the command

ssh -R :80:127.0.0.1:8080 v0@{frp address} -p 2200 tcp --proxy_name "test-tcp" --remote_port 9090

sets up a proxy on frps that forwards the local 8080 service to the port 9090.

frp (via SSH) (Ctrl+C to quit)

User:
ProxyName: test-tcp
Type: tcp
RemoteAddress: :9090

This is equivalent to:

frpc tcp --proxy_name "test-tcp" --local_ip 127.0.0.1 --local_port 8080 --remote_port 9090

Please refer to this document for more information.

Virtual Network (VirtualNet)

Alpha feature added in v0.62.0

The VirtualNet feature enables frp to create and manage virtual network connections between clients and visitors through a TUN interface. This allows for IP-level routing between machines, extending frp beyond simple port forwarding to support full network connectivity.

For detailed information about configuration and usage, please refer to the VirtualNet documentation.

Feature Gates

frp supports feature gates to enable or disable experimental features. This allows users to try out new features before they're considered stable.

Available Feature Gates

Enabling Feature Gates

To enable an experimental feature, add the feature gate to your configuration:

featureGates = { VirtualNet = true }

Feature Lifecycle

Features typically go through three stages:

1. ALPHA: Disabled by default, may be unstable
2. BETA: May be enabled by default, more stable but still evolving
3. GA (Generally Available): Enabled by default, ready for production use

Related Projects

• gofrp/plugin - A repository for frp plugins that contains a variety of plugins implemented based on the frp extension mechanism, meeting the customization needs of different scenarios.
• gofrp/tiny-frpc - A lightweight version of the frp client (around 3.5MB at minimum) implemented using the ssh protocol, supporting some of the most commonly used features, suitable for devices with limited resources.

Contributing

Interested in getting involved? We would like to help you!

• Take a look at our issues list and consider sending a Pull Request to dev branch.
• If you want to add a new feature, please create an issue first to describe the new feature, as well as the implementation approach. Once a proposal is accepted, create an implementation of the new features and submit it as a pull request.
• Sorry for my poor English. Improvements for this document are welcome, even some typo fixes.
• If you have great ideas, send an email to [email protected].

Note: We prefer you to give your advise in issues, so others with a same question can search it quickly and we don't need to answer them repeatedly.

Donation

If frp helps you a lot, you can support us by:

GitHub Sponsors

Support us by Github Sponsors.

You can have your company's logo placed on README file of this project.

PayPal

Donate money by PayPal to my account [email protected].

frp

README | 中文文档

frp 是一个专注于内网穿透的高性能的反向代理应用，支持 TCP、UDP、HTTP、HTTPS 等多种协议，且支持 P2P 通信。可以将内网服务以安全、便捷的方式通过具有公网 IP 节点的中转暴露到公网。

Sponsors

frp 是一个完全开源的项目，我们的开发工作完全依靠赞助者们的支持。如果你愿意加入他们的行列，请考虑 赞助 frp 的开发。

Gold Sponsors

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为什么使用 frp ？

通过在具有公网 IP 的节点上部署 frp 服务端，可以轻松地将内网服务穿透到公网，同时提供诸多专业的功能特性，这包括：

• 客户端服务端通信支持 TCP、QUIC、KCP 以及 Websocket 等多种协议。
• 采用 TCP 连接流式复用，在单个连接间承载更多请求，节省连接建立时间，降低请求延迟。
• 代理组间的负载均衡。
• 端口复用，多个服务通过同一个服务端端口暴露。
• 支持 P2P 通信，流量不经过服务器中转，充分利用带宽资源。
• 多个原生支持的客户端插件（静态文件查看，HTTPS/HTTP 协议转换，HTTP、SOCK5 代理等），便于独立使用 frp 客户端完成某些工作。
• 高度扩展性的服务端插件系统，易于结合自身需求进行功能扩展。
• 服务端和客户端 UI 页面。

开发状态

frp 目前已被很多公司广泛用于测试、生产环境。

master 分支用于发布稳定版本，dev 分支用于开发，您可以尝试下载最新的 release 版本进行测试。

我们正在进行 v2 大版本的开发，将会尝试在各个方面进行重构和升级，且不会与 v1 版本进行兼容，预计会持续较长的一段时间。

现在的 v0 版本将会在合适的时间切换为 v1 版本并且保证兼容性，后续只做 bug 修复和优化，不再进行大的功能性更新。

关于 v2 的一些说明

v2 版本的复杂度和难度比我们预期的要高得多。我只能利用零散的时间进行开发，而且由于上下文经常被打断，效率极低。由于这种情况可能会持续一段时间，我们仍然会在当前版本上进行一些优化和迭代，直到我们有更多空闲时间来推进大版本的重构，或者也有可能放弃一次性的重构，而是采用渐进的方式在当前版本上逐步做一些可能会导致不兼容的修改。

v2 的构想是基于我多年在云原生领域，特别是在 K8s 和 ServiceMesh 方面的工作经验和思考。它的核心是一个现代化的四层和七层代理，类似于 envoy。这个代理本身高度可扩展，不仅可以用于实现内网穿透的功能，还可以应用于更多领域。在这个高度可扩展的内核基础上，我们将实现 frp v1 中的所有功能，并且能够以一种更加优雅的方式实现原先架构中无法实现或不易实现的功能。同时，我们将保持高效的开发和迭代能力。

除此之外，我希望 frp 本身也成为一个高度可扩展的系统和平台，就像我们可以基于 K8s 提供一系列扩展能力一样。在 K8s 上，我们可以根据企业需求进行定制化开发，例如使用 CRD、controller 模式、webhook、CSI 和 CNI 等。在 frp v1 中，我们引入了服务端插件的概念，实现了一些简单的扩展性。但是，它实际上依赖于简单的 HTTP 协议，并且需要用户自己启动独立的进程和管理。这种方式远远不够灵活和方便，而且现实世界的需求千差万别，我们不能期望一个由少数人维护的非营利性开源项目能够满足所有人的需求。

最后，我们意识到像配置管理、权限验证、证书管理和管理 API 等模块的当前设计并不够现代化。尽管我们可能在 v1 版本中进行一些优化，但确保兼容性是一个令人头疼的问题，需要投入大量精力来解决。

非常感谢您对 frp 的支持。

文档

完整文档已经迁移至 https://gofrp.org。

为 frp 做贡献

frp 是一个免费且开源的项目，我们欢迎任何人为其开发和进步贡献力量。

• 在使用过程中出现任何问题，可以通过 issues 来反馈。
• Bug 的修复可以直接提交 Pull Request 到 dev 分支。
• 如果是增加新的功能特性，请先创建一个 issue 并做简单描述以及大致的实现方法，提议被采纳后，就可以创建一个实现新特性的 Pull Request。
• 欢迎对说明文档做出改善，帮助更多的人使用 frp，特别是英文文档。
• 贡献代码请提交 PR 至 dev 分支，master 分支仅用于发布稳定可用版本。
• 如果你有任何其他方面的问题或合作，欢迎发送邮件至 [email protected] 。

提醒：和项目相关的问题请在 issues 中反馈，这样方便其他有类似问题的人可以快速查找解决方法，并且也避免了我们重复回答一些问题。

关联项目

• gofrp/plugin - frp 插件仓库，收录了基于 frp 扩展机制实现的各种插件，满足各种场景下的定制化需求。
• gofrp/tiny-frpc - 基于 ssh 协议实现的 frp 客户端的精简版本(最低约 3.5MB 左右)，支持常用的部分功能，适用于资源有限的设备。

赞助

如果您觉得 frp 对你有帮助，欢迎给予我们一定的捐助来维持项目的长期发展。

Sponsors

长期赞助可以帮助我们保持项目的持续发展。

您可以通过 GitHub Sponsors 赞助我们。

国内用户可以通过 爱发电 赞助我们。

企业赞助者可以将贵公司的 Logo 以及链接放置在项目 README 文件中。

Server Plugin

frp server plugin is aimed to extend frp's ability without modifying the Golang code.

An external server should run in a different process receiving RPC calls from frps.
Before frps is doing some operations, it will send RPC requests to notify the external RPC server and act according to its response.

RPC request

RPC requests are based on JSON over HTTP.

When a server plugin accepts an operation request, it can respond with three different responses:

• Reject operation and return a reason.
• Allow operation and keep original content.
• Allow operation and return modified content.

Interface

HTTP path can be configured for each manage plugin in frps. We'll assume for this example that it's /handler.

A request to the RPC server will look like:

POST /handler?version=0.1.0&op=Login
{
    "version": "0.1.0",
    "op": "Login",
    "content": {
        ... // Operation info
    }
}

Request Header:
X-Frp-Reqid: for tracing

The response can look like any of the following:

• Non-200 HTTP response status code (this will automatically tell frps that the request should fail)

• Reject operation:

{
    "reject": true,
    "reject_reason": "invalid user"
}

• Allow operation and keep original content:

{
    "reject": false,
    "unchange": true
}

• Allow operation and modify content

{
    "unchange": "false",
    "content": {
        ... // Replaced content
    }
}

Operation

Currently Login, NewProxy, CloseProxy, Ping, NewWorkConn and NewUserConn operations are supported.

Login

Client login operation

{
    "content": {
        "version": <string>,
        "hostname": <string>,
        "os": <string>,
        "arch": <string>,
        "user": <string>,
        "timestamp": <int64>,
        "privilege_key": <string>,
        "run_id": <string>,
        "pool_count": <int>,
        "metas": map<string>string,
        "client_address": <string>
    }
}

NewProxy

Create new proxy

{
    "content": {
        "user": {
            "user": <string>,
            "metas": map<string>string
            "run_id": <string>
        },
        "proxy_name": <string>,
        "proxy_type": <string>,
        "use_encryption": <bool>,
        "use_compression": <bool>,
        "bandwidth_limit": <string>,
        "bandwidth_limit_mode": <string>,
        "group": <string>,
        "group_key": <string>,

        // tcp and udp only
        "remote_port": <int>,

        // http and https only
        "custom_domains": []<string>,
        "subdomain": <string>,
        "locations": []<string>,
        "http_user": <string>,
        "http_pwd": <string>,
        "host_header_rewrite": <string>,
        "headers": map<string>string,

        // stcp only
        "sk": <string>,

        // tcpmux only
        "multiplexer": <string>

        "metas": map<string>string
    }
}

CloseProxy

A previously created proxy is closed.

Please note that one request will be sent for every proxy that is closed, do NOT use this
if you have too many proxies bound to a single client, as this may exhaust the server's resources.

{
    "content": {
        "user": {
            "user": <string>,
            "metas": map<string>string
            "run_id": <string>
        },
        "proxy_name": <string>
    }
}

Ping

Heartbeat from frpc

{
    "content": {
        "user": {
            "user": <string>,
            "metas": map<string>string
            "run_id": <string>
        },
        "timestamp": <int64>,
        "privilege_key": <string>
    }
}

NewWorkConn

New work connection received from frpc (RPC sent after run_id is matched with an existing frp connection)

{
    "content": {
        "user": {
            "user": <string>,
            "metas": map<string>string
            "run_id": <string>
        },
        "run_id": <string>
        "timestamp": <int64>,
        "privilege_key": <string>
    }
}

NewUserConn

New user connection received from proxy (support tcp, stcp, https and tcpmux) .

{
    "content": {
        "user": {
            "user": <string>,
            "metas": map<string>string
            "run_id": <string>
        },
        "proxy_name": <string>,
        "proxy_type": <string>,
        "remote_addr": <string>
    }
}

Server Plugin Configuration

# frps.toml
bindPort = 7000

[[httpPlugins]]
name = "user-manager"
addr = "127.0.0.1:9000"
path = "/handler"
ops = ["Login"]

[[httpPlugins]]
name = "port-manager"
addr = "127.0.0.1:9001"
path = "/handler"
ops = ["NewProxy"]

• addr: the address where the external RPC service listens. Defaults to http. For https, specify the schema: addr = "https://127.0.0.1:9001".
• path: http request url path for the POST request.
• ops: operations plugin needs to handle (e.g. "Login", "NewProxy", ...).
• tlsVerify: When the schema is https, we verify by default. Set this value to false if you want to skip verification.

Metadata

Metadata will be sent to the server plugin in each RPC request.

There are 2 types of metadata entries - global one and the other under each proxy configuration.
Global metadata entries will be sent in Login under the key metas, and in any other RPC request under user.metas.
Metadata entries under each proxy configuration will be sent in NewProxy op only, under metas.

This is an example of metadata entries:

# frpc.toml
serverAddr = "127.0.0.1"
serverPort = 7000
user = "fake"
metadatas.token = "fake"
metadatas.version = "1.0.0"

[[proxies]]
name = "ssh"
type = "tcp"
localPort = 22
remotePort = 6000
metadatas.id = "123"