go-restful

package for building REST-style Web Services using Google Go

• Code examples use v3

REST asks developers to use HTTP methods explicitly and in a way that's consistent with the protocol definition. This basic REST design principle establishes a one-to-one mapping between create, read, update, and delete (CRUD) operations and HTTP methods. According to this mapping:

• GET = Retrieve a representation of a resource
• POST = Create if you are sending content to the server to create a subordinate of the specified resource collection, using some server-side algorithm.
• PUT = Create if you are sending the full content of the specified resource (URI).
• PUT = Update if you are updating the full content of the specified resource.
• DELETE = Delete if you are requesting the server to delete the resource
• PATCH = Update partial content of a resource
• OPTIONS = Get information about the communication options for the request URI

Usage

Without Go Modules

All versions up to v2.*.* (on the master) are not supporting Go modules.

import (
    restful "github.com/emicklei/go-restful"
)

Using Go Modules

As of version v3.0.0 (on the v3 branch), this package supports Go modules.

import (
    restful "github.com/emicklei/go-restful/v3"
)

Example

ws := new(restful.WebService)
ws.
    Path("/users").
    Consumes(restful.MIME_XML, restful.MIME_JSON).
    Produces(restful.MIME_JSON, restful.MIME_XML)

ws.Route(ws.GET("/{user-id}").To(u.findUser).
    Doc("get a user").
    Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")).
    Writes(User{}))     
...

func (u UserResource) findUser(request *restful.Request, response *restful.Response) {
    id := request.PathParameter("user-id")
    ...
}

Full API of a UserResource

Features

• Routes for request → function mapping with path parameter (e.g. {id} but also prefix_{var} and {var}_suffix) support
• Configurable router:
  • (default) Fast routing algorithm that allows static elements, google custom method, regular expressions and dynamic parameters in the URL path (e.g. /resource/name:customVerb, /meetings/{id} or /static/{subpath:*})
  • Routing algorithm after JSR311 that is implemented using (but does not accept) regular expressions
• Request API for reading structs from JSON/XML and accessing parameters (path,query,header)
• Response API for writing structs to JSON/XML and setting headers
• Customizable encoding using EntityReaderWriter registration
• Filters for intercepting the request → response flow on Service or Route level
• Request-scoped variables using attributes
• Containers for WebServices on different HTTP endpoints
• Content encoding (gzip,deflate) of request and response payloads
• Automatic responses on OPTIONS (using a filter)
• Automatic CORS request handling (using a filter)
• API declaration for Swagger UI (go-restful-openapi)
• Panic recovery to produce HTTP 500, customizable using RecoverHandler(...)
• Route errors produce HTTP 404/405/406/415 errors, customizable using ServiceErrorHandler(...)
• Configurable (trace) logging
• Customizable gzip/deflate readers and writers using CompressorProvider registration
• Inject your own http.Handler using the HttpMiddlewareHandlerToFilter function
• Added SetPathTokenCacheEnabled and SetCustomVerbCacheEnabled to disable regexp caching (default=true)

How to customize

There are several hooks to customize the behavior of the go-restful package.

• Router algorithm
• Panic recovery
• JSON decoder
• Trace logging
• Compression
• Encoders for other serializers
• Use the package variable TrimRightSlashEnabled (default true) to control the behavior of matching routes that end with a slash /

Resources

• Example programs
• Example posted on blog
• Design explained on blog
• sourcegraph
• showcase: Zazkia - tcp proxy for testing resiliency
• showcase: Mora - MongoDB REST Api server

Type git shortlog -s for a full list of contributors.

© 2012 - 2023, http://ernestmicklei.com. MIT License. Contributions are welcome.