# Gin Web Framework
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Gin is a web framework written in Go (Golang). It features a martini-like API with performance that is up to 40 times faster thanks to [httprouter](https://github.com/julienschmidt/httprouter). If you need performance and good productivity, you will love Gin.
## Contents
- [Gin Web Framework](#gin-web-framework)
- [Contents](#contents)
- [Installation](#installation)
- [Quick start](#quick-start)
- [Benchmarks](#benchmarks)
- [Gin v1. stable](#gin-v1-stable)
- [Build with jsoniter/go-json](#build-with-json-replacement)
- [Build without `MsgPack` rendering feature](#build-without-msgpack-rendering-feature)
- [API Examples](#api-examples)
- [Using GET, POST, PUT, PATCH, DELETE and OPTIONS](#using-get-post-put-patch-delete-and-options)
- [Parameters in path](#parameters-in-path)
- [Querystring parameters](#querystring-parameters)
- [Multipart/Urlencoded Form](#multiparturlencoded-form)
- [Another example: query + post form](#another-example-query--post-form)
- [Map as querystring or postform parameters](#map-as-querystring-or-postform-parameters)
- [Upload files](#upload-files)
- [Single file](#single-file)
- [Multiple files](#multiple-files)
- [Grouping routes](#grouping-routes)
- [Blank Gin without middleware by default](#blank-gin-without-middleware-by-default)
- [Using middleware](#using-middleware)
- [How to write log file](#how-to-write-log-file)
- [Custom Log Format](#custom-log-format)
- [Controlling Log output coloring](#controlling-log-output-coloring)
- [Model binding and validation](#model-binding-and-validation)
- [Custom Validators](#custom-validators)
- [Only Bind Query String](#only-bind-query-string)
- [Bind Query String or Post Data](#bind-query-string-or-post-data)
- [Bind Uri](#bind-uri)
- [Bind Header](#bind-header)
- [Bind HTML checkboxes](#bind-html-checkboxes)
- [Multipart/Urlencoded binding](#multiparturlencoded-binding)
- [XML, JSON, YAML and ProtoBuf rendering](#xml-json-yaml-and-protobuf-rendering)
- [SecureJSON](#securejson)
- [JSONP](#jsonp)
- [AsciiJSON](#asciijson)
- [PureJSON](#purejson)
- [Serving static files](#serving-static-files)
- [Serving data from file](#serving-data-from-file)
- [Serving data from reader](#serving-data-from-reader)
- [HTML rendering](#html-rendering)
- [Custom Template renderer](#custom-template-renderer)
- [Custom Delimiters](#custom-delimiters)
- [Custom Template Funcs](#custom-template-funcs)
- [Multitemplate](#multitemplate)
- [Redirects](#redirects)
- [Custom Middleware](#custom-middleware)
- [Using BasicAuth() middleware](#using-basicauth-middleware)
- [Goroutines inside a middleware](#goroutines-inside-a-middleware)
- [Custom HTTP configuration](#custom-http-configuration)
- [Support Let's Encrypt](#support-lets-encrypt)
- [Run multiple service using Gin](#run-multiple-service-using-gin)
- [Graceful shutdown or restart](#graceful-shutdown-or-restart)
- [Third-party packages](#third-party-packages)
- [Manually](#manually)
- [Build a single binary with templates](#build-a-single-binary-with-templates)
- [Bind form-data request with custom struct](#bind-form-data-request-with-custom-struct)
- [Try to bind body into different structs](#try-to-bind-body-into-different-structs)
- [http2 server push](#http2-server-push)
- [Define format for the log of routes](#define-format-for-the-log-of-routes)
- [Set and get a cookie](#set-and-get-a-cookie)
- [Don't trust all proxies](#dont-trust-all-proxies)
- [Testing](#testing)
- [Users](#users)
## Installation
To install Gin package, you need to install Go and set your Go workspace first.
1. You first need [Go](https://golang.org/) installed (**version 1.14+ is required**), then you can use the below Go command to install Gin.
```sh
$ go get -u github.com/gin-gonic/gin
```
2. Import it in your code:
```go
import "github.com/gin-gonic/gin"
```
3. (Optional) Import `net/http`. This is required for example if using constants such as `http.StatusOK`.
```go
import "net/http"
```
## Quick start
```sh
# assume the following codes in example.go file
$ cat example.go
```
```go
package main
import (
"net/http"
"github.com/gin-gonic/gin"
)
func main() {
r := gin.Default()
r.GET("/ping", func(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{
"message": "pong",
})
})
r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
}
```
```
# run example.go and visit 0.0.0.0:8080/ping (for windows "localhost:8080/ping") on browser
$ go run example.go
```
## Benchmarks
Gin uses a custom version of [HttpRouter](https://github.com/julienschmidt/httprouter)
[See all benchmarks](/BENCHMARKS.md)
| Benchmark name | (1) | (2) | (3) | (4) |
| ------------------------------ | ---------:| ---------------:| ------------:| ---------------:|
| BenchmarkGin_GithubAll | **43550** | **27364 ns/op** | **0 B/op** | **0 allocs/op** |
| BenchmarkAce_GithubAll | 40543 | 29670 ns/op | 0 B/op | 0 allocs/op |
| BenchmarkAero_GithubAll | 57632 | 20648 ns/op | 0 B/op | 0 allocs/op |
| BenchmarkBear_GithubAll | 9234 | 216179 ns/op | 86448 B/op | 943 allocs/op |
| BenchmarkBeego_GithubAll | 7407 | 243496 ns/op | 71456 B/op | 609 allocs/op |
| BenchmarkBone_GithubAll | 420 | 2922835 ns/op | 720160 B/op | 8620 allocs/op |
| BenchmarkChi_GithubAll | 7620 | 238331 ns/op | 87696 B/op | 609 allocs/op |
| BenchmarkDenco_GithubAll | 18355 | 64494 ns/op | 20224 B/op | 167 allocs/op |
| BenchmarkEcho_GithubAll | 31251 | 38479 ns/op | 0 B/op | 0 allocs/op |
| BenchmarkGocraftWeb_GithubAll | 4117 | 300062 ns/op | 131656 B/op | 1686 allocs/op |
| BenchmarkGoji_GithubAll | 3274 | 416158 ns/op | 56112 B/op | 334 allocs/op |
| BenchmarkGojiv2_GithubAll | 1402 | 870518 ns/op | 352720 B/op | 4321 allocs/op |
| BenchmarkGoJsonRest_GithubAll | 2976 | 401507 ns/op | 134371 B/op | 2737 allocs/op |
| BenchmarkGoRestful_GithubAll | 410 | 2913158 ns/op | 910144 B/op | 2938 allocs/op |
| BenchmarkGorillaMux_GithubAll | 346 | 3384987 ns/op | 251650 B/op | 1994 allocs/op |
| BenchmarkGowwwRouter_GithubAll | 10000 | 143025 ns/op | 72144