gorequest

README

GoRequest

GoRequest -- Simplified HTTP client ( inspired by famous SuperAgent lib in Node.js )

Sending request would never been fun and easier than this. It comes with lots of feature:

• Get/Post/Put/Head/Delete
• Set - simple header setting
• JSON - made it simple with JSON string as a parameter
• Proxy - sending request via proxy
• Timeout - setting timeout for a request
• RedirectPolicy
• more to come..

Installation

$ go get github.com/parnurzeal/gorequest

Documentation

See Go Doc or Go Walker for usage and details.

Status

Why should you use GoRequest?

GoRequest makes thing much more simple for you, making http client more awesome and fun like SuperAgent + golang style usage.

This is what you normally do for a simple GET without GoRequest:

resp, err := http.Get("http://example.com/")

With GoRequest:

request := gorequest.New()
resp, body, errs := request.Get("http://example.com/").End()

Or below if you don't want to reuse it for other requests.

resp, body, errs := gorequest.New().Get("http://example.com/").End()

How about getting control over HTTP client headers, redirect policy, and etc. Things is getting more complicated in golang. You need to create a Client, setting header in different command, ... to do just only one GET

client := &http.Client{
  CheckRedirect: redirectPolicyFunc,
}

req, err := http.NewRequest("GET", "http://example.com", nil)

req.Header.Add("If-None-Match", `W/"wyzzy"`)
resp, err := client.Do(req)

Why making things ugly while you can just do as follows:

request := gorequest.New()
resp, body, errs := request.Get("http://example.com").
  RedirectPolicy(redirectPolicyFunc).
  Set("If-None-Match", `W/"wyzzy"`).
  End()

DELETE, HEAD, POST, PUT are now supported and can be used the same way as GET:

request := gorequest.New()
resp, body, errs := request.Post("http://example.com").End()
// PUT -> request.Put("http://example.com").End()
// DELETE -> request.Delete("http://example.com").End()
// HEAD -> request.Head("http://example.com").End()

JSON

For a JSON POST with standard libraries, you might need to marshal map data structure to json format, setting header to 'application/json' (and other headers if you need to) and declare http.Client. So, you code become longer and hard to maintain:

m := map[string]interface{}{
  "name": "backy",
  "species": "dog",
}
mJson, _ := json.Marshal(m)
contentReader := bytes.NewReader(mJson)
req, _ := http.NewRequest("POST", "http://example.com", contentReader)
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Notes","GoRequest is coming!")
client := &http.Client{}
resp, _ := client.Do(req)

Compared to our GoRequest version, JSON is for sure a default. So, it turns out to be just one simple line!:

request := gorequest.New()
resp, body, errs := request.Post("http://example.com").
  Set("Notes","gorequst is coming!").
  Send(`{"name":"backy", "species":"dog"}`).
  End()

Moreover, it is just too flexible that it also supports Struct type. So, you can have fun mix & match your request.

type BrowserVersionSupport struct {
  Chrome string
  Firefox string
}
ver := BrowserVersionSupport{ Chrome: "37.0.2041.6", Firefox: "30.0" }
request := gorequest.New()
resp, body, errs := request.Post("http://version.com/update")
  Send(ver).
  Send(`{"Safari":"5.1.10"}`).
  End()

Callback

Moreover, GoRequest also supports callback function. This gives you much more flexibility on using it. You can use it any way to match your own style! Let's see a bit of callback example:

func printBody(resp gorequest.Response, body string, errs []error){
  fmt.Println(resp.Status)
}
gorequest.New().Get("http://example.com").End(printBody)

Proxy

In the case when you are behind proxy, GoRequest can handle it easily with Proxy func:

request := gorequest.New().Proxy("http://proxy:999")
resp, body, errs:= request.Get("http://example-proxy.com").End()
// To reuse same client with no_proxy, use empty string:
resp, body, errs= request.Proxy("").("http://example-no-proxy.com").End()

Timeout

Timeout can be set in any time duration using time package:

request := gorequest.New().Timeout(2*time.Millisecond)
resp, body, errs:= request.Get("http://example.com").End()

License

GoRequest is MIT License.

Documentation

Overview

Package gorequest inspired by Nodejs SuperAgent provides easy-way to write http client

Index

• Variables
• type Request
• type Response
• type SuperAgent
  • func New() *SuperAgent
  • func (s *SuperAgent) ClearSuperAgent()
  • func (s *SuperAgent) Delete(targetUrl string) *SuperAgent
  • func (s *SuperAgent) End(callback ...func(response Response, body string, errs []error)) (Response, string, []error)
  • func (s *SuperAgent) Get(targetUrl string) *SuperAgent
  • func (s *SuperAgent) Head(targetUrl string) *SuperAgent
  • func (s *SuperAgent) Post(targetUrl string) *SuperAgent
  • func (s *SuperAgent) Proxy(proxyUrl string) *SuperAgent
  • func (s *SuperAgent) Put(targetUrl string) *SuperAgent
  • func (s *SuperAgent) Query(content string) *SuperAgent
  • func (s *SuperAgent) RedirectPolicy(policy func(req Request, via []Request) error) *SuperAgent
  • func (s *SuperAgent) Send(content interface{}) *SuperAgent
  • func (s *SuperAgent) SendString(content string) *SuperAgent
  • func (s *SuperAgent) Set(param string, value string) *SuperAgent
  • func (s *SuperAgent) Timeout(timeout time.Duration) *SuperAgent
  • func (s *SuperAgent) Type(typeStr string) *SuperAgent

Variables

var Types = map[string]string{
	"html":       "text/html",
	"json":       "application/json",
	"xml":        "application/xml",
	"urlencoded": "application/x-www-form-urlencoded",
	"form":       "application/x-www-form-urlencoded",
	"form-data":  "application/x-www-form-urlencoded",
}

Types

type Request

type Request *http.Request

type Response

type Response *http.Response

type SuperAgent

type SuperAgent struct {
	Url        string
	Method     string
	Header     map[string]string
	TargetType string
	ForceType  string
	Data       map[string]interface{}
	FormData   url.Values
	QueryData  url.Values
	Client     *http.Client
	Transport  *http.Transport
	Errors     []error
}

A SuperAgent is a object storing all request data for client.

func New

func New() *SuperAgent

Used to create a new SuperAgent object.

func (*SuperAgent) ClearSuperAgent

func (s *SuperAgent) ClearSuperAgent()

Clear SuperAgent data for another new request.

func (*SuperAgent) Delete

func (s *SuperAgent) Delete(targetUrl string) *SuperAgent

func (*SuperAgent) End

func (s *SuperAgent) End(callback ...func(response Response, body string, errs []error)) (Response, string, []error)

End is the most important function that you need to call when ending the chain. The request won't proceed without calling it. End function returns Response which matchs the structure of Response type in Golang's http package (but without Body data). The body data itself returns as a string in a 2nd return value. Lastly but worht noticing, error array (NOTE: not just single error value) is returned as a 3rd value and nil otherwise.

For example:

resp, body, errs := gorequest.New().Get("http://www.google.com").End()
if( errs != nil){
  fmt.Pritnln(errs)
}
fmt.Println(resp, body)

Moreover, End function also supports callback which you can put as a parameter. This extends the flexibility and makes GoRequest fun and clean! You can use GoRequest in whatever style you love!

For example:

func printBody(resp gorequest.Response, body string, errs []error){
  fmt.Println(resp.Status)
}
gorequest.New().Get("http://www..google.com").End(printBody)

func (*SuperAgent) Get

func (s *SuperAgent) Get(targetUrl string) *SuperAgent

func (*SuperAgent) Head

func (s *SuperAgent) Head(targetUrl string) *SuperAgent

TODO: testing for Head func

func (*SuperAgent) Post

func (s *SuperAgent) Post(targetUrl string) *SuperAgent

TODO: add test for Post

func (*SuperAgent) Proxy

func (s *SuperAgent) Proxy(proxyUrl string) *SuperAgent

Proxy function accepts a proxy url string to setup proxy url for any request. It provides a convenience way to setup proxy which have advantages over usual old ways. One example is you might try to set `http_proxy` environment. This means you are setting proxy up for all the requests. You will not be able to send different request with different proxy unless you change your `http_proxy` environment again. Another example is using Golang proxy setting. This is normal prefer way to do but too verbase compared to GoRequest's Proxy:

gorequest.New().Proxy("http://myproxy:9999").
  Post("http://www.google.com").
  End()

To set no_proxy, just put empty string to Proxy func:

gorequest.New().Proxy("").
  Post("http://www.google.com").
  End()

func (*SuperAgent) Put

func (s *SuperAgent) Put(targetUrl string) *SuperAgent

func (*SuperAgent) Query

func (s *SuperAgent) Query(content string) *SuperAgent

Query function accepts either json string or strings which will form a query-string in url of GET method or body of POST method. For example, making "/search?query=bicycle&size=50x50&weight=20kg" using GET method:

gorequest.New().
  Get("/search").
  Query(`{ query: 'bicycle' }`).
  Query(`{ size: '50x50' }`).
  Query(`{ weight: '20kg' }`).
  End()

Or you can put multiple json values:

gorequest.New().
  Get("/search").
  Query(`{ query: 'bicycle', size: '50x50', weight: '20kg' }`).
  End()

Strings are also acceptable:

gorequest.New().
  Get("/search").
  Query("query=bicycle&size=50x50").
  Query("weight=20kg").
  End()

Or even Mixed! :)

gorequest.New().
  Get("/search").
  Query("query=bicycle").
  Query(`{ size: '50x50', weight:'20kg' }`).
  End()

TODO: check error

func (*SuperAgent) RedirectPolicy

func (s *SuperAgent) RedirectPolicy(policy func(req Request, via []Request) error) *SuperAgent

func (*SuperAgent) Send

func (s *SuperAgent) Send(content interface{}) *SuperAgent

Send function accepts either json string or query strings which is usually used to assign data to POST or PUT method. Without specifying any type, if you give Send with json data, you are doing requesting in json format:

gorequest.New().
  Post("/search").
  Send(`{ query: 'sushi' }`).
  End()

While if you use at least one of querystring, GoRequest understands and automatically set the Content-Type to `application/x-www-form-urlencoded`

gorequest.New().
  Post("/search").
  Send("query=tonkatsu").
  End()

So, if you want to strictly send json format, you need to use Type func to set it as `json` (Please see more details in Type function). You can also do multiple chain of Send:

gorequest.New().
  Post("/search").
  Send("query=bicycle&size=50x50").
  Send(`{ wheel: '4'}`).
  End()

From v0.2.0, Send function provide another convenience way to work with Struct type. You can mix and match it with json and query string:

type BrowserVersionSupport struct {
  Chrome string
  Firefox string
}
ver := BrowserVersionSupport{ Chrome: "37.0.2041.6", Firefox: "30.0" }
gorequest.New().
  Post("/update_version").
  Send(ver).
  Send(`{"Safari":"5.1.10"}`).
  End()

TODO: check error from form and add normal text mode or other mode to Send func

func (*SuperAgent) SendString

func (s *SuperAgent) SendString(content string) *SuperAgent

SendString returns SuperAgent's itself for any next chain and takes content string as a parameter. Its duty is to transform String into s.Data (map[string]interface{}) which later changes into appropriate format such as json, form, text, etc. in the End func. Send implicitly uses SendString and you should use Send instead of this.

func (*SuperAgent) Set

func (s *SuperAgent) Set(param string, value string) *SuperAgent

Set is used for setting header fields. Example. To set `Accept` as `application/json`

gorequest.New().
  Post("/gamelist").
  Set("Accept", "application/json").
  End()

TODO: make Set be able to get multiple fields

func (*SuperAgent) Timeout

func (s *SuperAgent) Timeout(timeout time.Duration) *SuperAgent

TODO-1: Add docs for Timeout TODO-2: a test for Timeout, check time and slow server

func (*SuperAgent) Type

func (s *SuperAgent) Type(typeStr string) *SuperAgent

Type is a convenience function to specify the data type to send. For example, to send data as `application/x-www-form-urlencoded` :

gorequest.New().
  Post("/recipe").
  Type("form").
  Send(`{ name: "egg benedict", category: "brunch" }`).
  End()

This will POST the body "name=egg benedict&category=brunch" to url /recipe

GoRequest supports

"text/html" uses "html"
"application/json" uses "json"
"application/xml" uses "xml"
"application/x-www-form-urlencoded" uses "urlencoded", "form" or "form-data"