Read Web pages using Go's net/http implementation

This is a creation in Article, where the information may have evolved or changed.

Package Main

Import(

"FMT"

"Io/ioutil"//[1]

"Net/http"//[2]

"OS"//[3]

"Path/filepath"//[4]

)

FuncMain (){

Iflen(OS. Args)!=2{

Fmt. Printf ("useage:%shttp://url",filepath. Base (OS. args[0]))

Os. Exit (1)

}

RESP,err: =http. Get (OS. args[1])

Iferr!=Nil{

Fmt. PRINTLN (Err)//go language will contain a detailed description of the error, you can try different parameters to test

Os. Exit (2)

}

 defer Resp. Body.close () //the Client must Close  the Response Body  when finished  with it: 

Body,err2: =ioutil. ReadAll (resp. Body)//The package "1" is used here

Iferr2!=Nil{

Fmt. Println (ERR2)

Os. Exit (3)

}

Fmt. Printf ("%s",body)

}

# #生成程序测试 Getwebpage.exe
Useage:getwebpage.exe Http://urlGetwebpage.exe HTTP://WW
Get http://ww:dial Tcp:GetAddrInfoW:No Such host is known.Getwebpage.exe htt
Get htt:unsupported protocol scheme ""

Instructions in DOS after executing the command "godoc-http=:8000" can be found in the relevant package http://127.0.0.1:8000/pkg/net/http/http://127.0.0.1:8000/pkg/io/ioutil/ #ReadAll Package HTTP provides HTTP client and server implementations. Get, Head, Post, and Postform make HTTP (or HTTPS) Requests:resp, err: = http. Get ("http://example.com/") ... resp, err: = http. Post ("Http://example.com/upload", "Image/jpeg", &buf) ... resp, err: = http. Postform ("Http://example.com/form", url. values{"key": {"Value"}, "id": {"123"}})
Func ReadAll (R io. Reader) ([]byte, error) ReadAll reads from R until an error or EOF and returns the data it read. A successful call returns err = = Nil, not err = = EOF. Because ReadAll is defined-to-read from SRC until-eof, it does not treat a EOF from read as a error to be reported.