I have been in DevOps related jobs for past 6 years dealing mainly with Kubernetes in AWS and on-premise as well. I spent quite a lot …
Go http.Redirect(...) set redirection manually with headers
package main
import (
"fmt"
"html/template"
"net/http"
)
// Redirects:
// - StatusMultipleChoices = 300 // RFC 7231, 6.4.1
// - StatusMovedPermanently = 301 // RFC 7231, 6.4.2
// - StatusFound = 302 // RFC 7231, 6.4.3
// - StatusSeeOther = 303 // RFC 7231, 6.4.4
// - StatusNotModified = 304 // RFC 7232, 4.1
// - StatusUseProxy = 305 // RFC 7231, 6.4.5
// - StatusTemporaryRedirect = 307 // RFC 7231, 6.4.7
// - StatusPermanentRedirect = 308 // RFC 7538, 3
var tpl *template.Template
func init() {
tpl = template.Must(template.ParseFiles("index.gohtml"))
}
func main() {
http.HandleFunc("/", foo)
http.HandleFunc("/bar", bar)
http.HandleFunc("/barred", barred)
http.Handle("/favicon.ico", http.NotFoundHandler())
http.ListenAndServe(":8080", nil)
}
// Options for <form> and POST method in particular
// - <form method="POST" enctype="multipart/form-data">
// - <form method="POST" enctype="multipart/x-www-form-urlencoded">
// - <form method="POST" enctype="text/plain">
func foo(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Foo, request method: %v\n", r.Method)
// io.WriteString(w, "foo was called ...")
}
func bar(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Bar, request method: %v\n", r.Method)
// http.Redirect(w, r, "/", http.StatusTemporaryRedirect) // status code: 307
// Equivalent of the command above ^^^
w.Header().Set("Location", "/")
// Option 1.
// 307 does not change the METHOD
// w.WriteHeader(http.StatusTemporaryRedirect)
// Option 2.
// 303 change the METHOD to GET
w.WriteHeader(http.StatusSeeOther)
}
func barred(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Barred, request method: %v\n", r.Method)
tpl.ExecuteTemplate(w, "index.gohtml", nil)
// io.WriteString(w, "barred was called ...")
}
// <!DOCTYPE html>
// <html lang="en">
// <head>
// <meta charset="UTF-8">
// <title>Status StatusTemporaryRedirect 307 </title>
// </head>
// <body>
// <form method="POST" action="/bar" enctype="text/plain">
// <label for="idx-f">First Name</label>
// <input type="text" id="idx-f" name="first"><br>
// <input type="submit">
// </form>
// </body>
// </html>