[Feature request] Add reverse proxy supporting about gout

[guonaihong]

Add Proxy() function
Fake code

g := gout.New(nil)
s := ""

err := g.GET("http://www.google.com").SetProxy("http://127.0.0.1").BindBody(&s).Do()
if err != nil {
}

Can such an API be?

[zheeeng]

It there an API for changing request origin ? For example proxy https://www.elgoog.com/search?q=test is equivalent to https://www.google.com/search?q=test.

g.Proxy(request, g.ProxyOptopn{
     Url: func (url: http.Url) {
        // modify the url from elgoog to google
     },
     Header: map[string]string{origin: 'www.google.com'}   // merge and override the origianl request's headers
})

proxy keeps the original methods and other headers unchanged.

[guonaihong]

There are only two APIs for implementing the proxy function in golang. From the documentation point of view, the proxy client is transparent, and only forwards the original request to the proxy server. It seems that the client does not need to do additional processing.

func ProxyFromEnvironment(req *Request) (*url.URL, error)
func ProxyURL(fixedURL *url.URL) func(*Request) (*url.URL, error)

doc

https://golang.google.cn/pkg/net/http/#ProxyURL

[guonaihong]

The proxy function is developed. If there is no problem, I plan to merge it into the main branch.
Below is the test code I wrote.

• proxy-server

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/guonaihong/gout"
)

func main() {
	r := gin.Default()
	r.Any("/*action", func(c *gin.Context) {
		fmt.Printf("%#v\n", c.Request)
		var s string
		fmt.Printf("url = %s\n", c.Request.URL.String())
		err := gout.Def().GET(c.Request.URL.String()).BindBody(&s).Do()
		if err != nil {
			c.String(200, err.Error())
			return
		}
		c.String(200, s)
	})

	r.Run(":7000")
}

• proxy-client.go

package main

import (
	"fmt"
	"github.com/guonaihong/gout"
	"log"
)

func main() {
	var s string
	err := gout.Def().GET("www.qq.com").SetProxy("http://127.0.0.1:7000").BindBody(&s).Do()
	if err != nil {
		log.Println(err)
		return
	}

	fmt.Println(s)
}

[guonaihong]

I am closed, if you have any questions, you can reopen it.