Echo

Fast and unfancy HTTP server framework for Go (Golang). Up to 10x faster than the rest.

Feature Overview

Optimized HTTP router which smartly prioritize routes.
Build robust and scalable RESTful APIs.
Run with standard HTTP server or FastHTTP server.
Group APIs.
Extensible middleware framework.
Define middleware at root, group or route level.
Data binding for JSON, XML and form payload.
Handy functions to send variety of HTTP responses.
Centralized HTTP error handling.
Template rendering with any template engine.
Define your format for the logger.
Highly customizable.

Performance

Environment:
- Go 1.6
- wrk 4.0.0
- 2 GB, 2 Core (DigitalOcean)
Test Suite: https://github.com/vishr/web-framework-benchmark
Date: 4/4/2016

Quick Start

Installation

$ go get github.com/labstack/echo/...

Hello, World!

Create server.go

package main

import (
	"net/http"
	"github.com/labstack/echo"
	"github.com/labstack/echo/engine/standard"
)

func main() {
	e := echo.New()
	e.GET("/", func(c echo.Context) error {
		return c.String(http.StatusOK, "Hello, World!")
	})
	e.Run(standard.New(":1323"))
}

Start server

$ go run server.go

Browse to http://localhost:1323 and you should see Hello, World! on the page.

Routing

e.POST("/users", saveUser)
e.GET("/users/:id", getUser)
e.PUT("/users/:id", updateUser)
e.DELETE("/users/:id", deleteUser)

Path Parameters

func getUser(c echo.Context) error {
	// User ID from path `users/:id`
	id := c.Param("id")
}

Query Parameters

/show?team=x-men&member=wolverine

func show(c echo.Context) error {
	// Get team and member from the query string
	team := c.QueryParam("team")
	member := c.QueryParam("member")
}

Form `application/x-www-form-urlencoded`

POST /save

name	value
name	Joe Smith
email	joe@labstack.com

func save(c echo.Context) error {
	// Get name and email
	name := c.FormValue("name")
	email := c.FormValue("email")
}

Form `multipart/form-data`

POST /save

name	value
name	Joe Smith
email	joe@labstack.com
avatar	avatar

func save(c echo.Context) error {
	// Get name and email
	name := c.FormValue("name")
	email := c.FormValue("email")
	// Get avatar
	avatar, err := c.FormFile("avatar")
	if err != nil {
		return err
	}

	// Source
	src, err := avatar.Open()
	if err != nil {
		return err
	}
	defer src.Close()

	// Destination
	dst, err := os.Create(avatar.Filename)
	if err != nil {
		return err
	}
	defer dst.Close()

	// Copy
	if _, err = io.Copy(dst, src); err != nil {
		return err
	}

	return c.HTML(http.StatusOK, "<b>Thank you!</b>")
}

Handling Request

Bind JSON or XML or form payload into Go struct based on Content-Type request header.
Render response as JSON or XML with status code.

type User struct {
	Name  string `json:"name" xml:"name" form:"name"`
	Email string `json:"email" xml:"email" form:"email"`
}

e.POST("/users", func(c echo.Context) error {
	u := new(User)
	if err := c.Bind(u); err != nil {
		return err
	}
	return c.JSON(http.StatusCreated, u)
	// or
	// return c.XML(http.StatusCreated, u)
})

Static Content

Server any file from static directory for path /static/*.

e.Static("/static", "static")

More...

Template Rendering

Middleware

// Root level middleware
e.Use(middleware.Logger())
e.Use(middleware.Recover())

// Group level middleware
g := e.Group("/admin")
g.Use(middleware.BasicAuth(func(username, password string) bool {
	if username == "joe" && password == "secret" {
		return true
	}
	return false
}))

// Route level middleware
track := func(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		println("request to /users")
		return next(c)
	}
}
e.GET("/users", func(c echo.Context) error {
	return c.String(http.StatusOK, "/users")
}, track)

Built-in Middleware

Middleware	Description
BodyLimit	Limit request body
Logger	Log HTTP requests
Recover	Recover from panics
Gzip	Send gzip HTTP response
BasicAuth	HTTP basic authentication
JWTAuth	JWT authentication
Secure	Protection against attacks
CORS	Cross-Origin Resource Sharing
CSRF	Cross-Site Request Forgery
Static	Serve static files
AddTrailingSlash	Add trailing slash to the request URI
RemoveTrailingSlash	Remove trailing slash from the request URI
MethodOverride	Override request method