echo/README.md

NOTICE

• Master branch, website and godoc now points to Echo v2.
• Echo v2 is in beta but if you want to try it out here is the migrating [guide] (https://labstack.com/echo/guide/migrating/)
• Looking for v1?
  • Installation: Use a package manager (https://github.com/Masterminds/glide, it's nice!) to get stable v1 release/commit or use go get gopkg.in/labstack/echo.v1.
  • Godoc: https://godoc.org/gopkg.in/labstack/echo.v1
  • Docs: https://github.com/labstack/echo/tree/v1.4/website/content

Echo

Echo is a fast and unfancy web framework for Go (Golang). Up to 10x faster than the rest.

Features

• 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.
• 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.FormParam("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.FormParam("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 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"`
	Email string `json:"email" xml:"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
Logger	Log HTTP requests
Recover	Recover from panics
Gzip	Send gzip HTTP response
BasicAuth	HTTP basic authentication
CORS	Cross-Origin Resource Sharing
AddTrailingSlash	Add trailing slash to the request URI
RemoveTrailingSlash	Remove trailing slash from the request URI

More...

Next

• Head over to guide
• Browse recipes

Need help?

• Hop on to chat
• Open an issue

Support Us

• ⭐ the project
• Donate
• 🌎 spread the word
• Contribute to the project

Contribute

Use issues for everything

• Report issues
• Discuss on chat before sending a pull request
• Suggest new features or enhancements
• Improve/fix documentation

Credits

• Vishal Rana - Author
• Nitin Rana - Consultant
• Contributors

License

MIT