#pkg~net~http

[golang-examples]

Extract an uploaded zip file

Extract a HTTP POSTed zip file. req.Body can't be passed directly to zip.NewReader() as it doesn't implement ReadAt(). Wrap it with bytes.NewReader().

body, err := ioutil.ReadAll(req.Body) if err != nil { // err } r, err := zip.NewReader(bytes.NewReader(body), req.ContentLength) if err != nil { // err } for _, zf := range r.File { dst, err := os.Create(zf.Name) if err != nil { // err } defer dst.Close() src, err := zf.Open() if err != nil { // err } defer src.Close() io.Copy(dst, src) }

Note: this implementation doesn't support subdirectory.

[golang-examples]

Simple CGI app

Use net/http/cgi.

package main import ( "net/http/cgi" "net/http" "fmt" ) func errorResponse(code int, msg string) { fmt.Printf("Status:%d %s\r\n", code, msg) fmt.Printf("Content-Type: text/plain\r\n") fmt.Printf("\r\n") fmt.Printf("%s\r\n", msg) } func main() { var req *http.Request var err error req, err = cgi.Request() if err != nil { errorResponse(500, "cannot get cgi request" + err.Error()) return } // Use req to handle request fmt.Printf("Content-Type: text/plain\r\n") fmt.Printf("\r\n") fmt.Printf("req=%v\r\n", req) }

[golang-examples]

Get query value in HTTP handler

req.URL.Query() returns a map which implements Get() method.

func someHandler(w http.ResponseWriter, r *http.Request) { query := req.URL.Query() val1 := query.Get("key1") val2 := query.Get("key2")

Strings are URL-decoded automatically in URL.Query().

When method is GET, req.FormValue() can be also used to get query. However when method is POST, you need to use req.URL.Query().

[golang-examples]

HTTP Client with Basic Authentication

Add HTTP header with SetBasicAuth().

req, err := http.NewRequest("GET", url, nil) req.SetBasicAuth(user, pass) cli := &http.Client{} resp, err := cli.Do(req)

There's no API for digest authentication in standard library.

[golang-examples]

Simple file server

Simple file server package main import ( "net/http" ) func main() { http.Handle("/", http.FileServer(http.Dir("./"))) http.ListenAndServe(":8123", nil) }

[golang-examples]

HTTP handler func

Example handler func. func someHandler(w http.ResponseWriter, r *http.Request) { // read form value value := r.FormValue("value") if r.Method == "POST" { // receive posted data body, err := ioutil.ReadAll(r.Body) } func main() { http.HandleFunc("/", someHandler) http.ListenAndServe(":8080", nil) }

[golang-examples]

Add custom HTTP header

Set a header to a request first. Pass the request to a client. client := &http.Client{] req, err := http.NewRequest("POST", "http://example.com", bytes.NewReader(postData)) req.Header.Add("User-Agent", "myClient") resp, err := client.Do(req) defer resp.Body.Close()

[golang-examples]

Simple HTTP client

Just call http.Get(). resp, err := http.Get("http://www.google.co.jp") defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body)