Programming language: Go
License: MIT License
Tags: Web Frameworks    
Latest version: v0.5.2

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Go-Relax GoDoc Go Report Card

Build fast and complete RESTful APIs in Go

Go-Relax aims to provide the tools to help developers build RESTful web services, and information needed to abide by REST architectural constraints using correct HTTP semantics.

Quick Start

Install using "go get":

go get github.com/codehack/go-relax

Then import from your source:

import "github.com/codehack/go-relax"

View example_test.go for an extended example of basic usage and features.

Also, check the wiki for HowTo's and recipes.


  • Helps build API's that follow the REST concept using ROA principles.
  • Built-in support of HATEOAS constraint with Web Linking header tags.
  • Follows REST "best practices", with inspiration from Heroku and GitHub.
  • Works fine along with http.ServeMux or independently as http.Handler
  • Supports different media types, and mixed for requests and responses.
  • It uses JSON media type by default, but also includes XML (needs import).
  • The default routing engine uses trie with regexp matching for speed and flexibility.
  • Comes with a complete set of filters to build a working API. "Batteries included"
  • Uses sync.pool to efficiently use resources when under heavy load.

Included filters

  • [x] Content - handles mixed request/response encodings, language preference, and versioning.
  • [x] Basic authentication - to protect any resource with passwords.
  • [x] CORS - Cross-Origin Resource Sharing, for remote client-server setups.
  • [x] ETag - entity tagging with conditional requests for efficient caching.
  • [x] GZip - Dynamic gzip content data compression, with ETag support.
  • [x] Logging - custom logging with pre- and post- request event support.
  • [x] Method override - GET/POST method override via HTTP header and query string.
  • [x] Security - Various security practices for request handling.
  • [x] Limits - request throttler, token-based rate limiter, and memory limits.

Upcoming filters

  • [ ] Relaxed - Test API's compliance with Relax API Specification (based on REST).
  • [ ] JSON-API support.
  • [ ] JSON-Schema for validating requests and responses.
  • [ ] Collection-JSON support.


The full code documentation is located at GoDoc:


The source code is thoroughly commented, have a look.

Hello World

This minimal example creates a new Relax service that handles a Hello resource.

package main

import (

type Hello string

func (h *Hello) Index(ctx *relax.Context) {

func main() {
   h := Hello("hello world!")
   svc := relax.NewService("http://api.company.com/")

$ curl -i -X GET http://api.company.com/hello


HTTP/1.1 200 OK
Content-Type: application/json;charset=utf-8
Link: </hello>; rel="self"
Link: </hello>; rel="index"
Request-Id: 61d430de-7bb6-4ff8-84da-aff6fe81c0d2
Server: Go-Relax/0.5.0
Date: Thu, 14 Aug 2014 06:20:48 GMT
Content-Length: 14

"hello world!"


Go-Relax is Copyright (c) Codehack. Published under an MIT License

*Note that all licence references and agreements mentioned in the go-relax README section above are relevant to that project's source code only.