Last active
August 29, 2015 14:03
-
-
Save campoy/f8fe6cf2cee366da9e8b to your computer and use it in GitHub Desktop.
A small web server with a customized 404 page showed in two different ways, wrapping the ResponseWriter or wrapping the Handler
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>404 - not found</title> | |
| <style> | |
| * { | |
| padding: 0; | |
| margin: 0; | |
| } | |
| html { | |
| -webkit-font-smoothing: antialiased; | |
| background-color: #fafafa; | |
| } | |
| body { | |
| font-family:'Helvetica Neue', Helvetica, Arial, 'lucida grande', tahoma, verdana, arial, sans-serif; | |
| color: #222222; | |
| margin: 0; | |
| line-height: 1.5em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div style="padding:40px;"> | |
| <h2>404 - not found</h2> | |
| <hr size="1" width="30%" /> | |
| <br/><a href="/">go back</a> | |
| </div> | |
| </body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| import ( | |
| "flag" | |
| "io/ioutil" | |
| "log" | |
| "net/http" | |
| "os" | |
| "path/filepath" | |
| ) | |
| var ( | |
| address = flag.String("address", ":3000", "tcp4 host and port to listen") | |
| root = flag.String("root", ".", "root directory") | |
| ) | |
| type fileServer struct { | |
| root http.Dir | |
| fs http.Handler | |
| page []byte | |
| } | |
| func newFileServer(root http.Dir, page []byte) http.Handler { | |
| return fileServer{root, http.FileServer(root), page} | |
| } | |
| func (s fileServer) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| _, err := s.root.Open(r.URL.Path) | |
| if err != nil { | |
| w.Header().Set("Content-Type", "text/html; charset=utf-8") | |
| w.WriteHeader(http.StatusNotFound) | |
| w.Write(s.page) | |
| return | |
| } | |
| s.fs.ServeHTTP(w, r) | |
| } | |
| func main() { | |
| flag.Parse() | |
| // Parse the not found page. | |
| f, err := os.Open(filepath.Join(*root, "notfound.html")) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| page, err := ioutil.ReadAll(f) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| fs := newFileServer(http.Dir(*root), page) | |
| log.Fatal(http.ListenAndServe(*address, fs)) | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| import ( | |
| "bytes" | |
| "flag" | |
| "io" | |
| "io/ioutil" | |
| "log" | |
| "net/http" | |
| "os" | |
| "path/filepath" | |
| ) | |
| var ( | |
| address = flag.String("address", ":3000", "tcp4 host and port to listen") | |
| root = flag.String("root", ".", "root directory") | |
| ) | |
| type NotFoundHandler struct { | |
| h http.Handler | |
| page []byte | |
| } | |
| func (h NotFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| wr := &response{header: w.Header()} | |
| h.h.ServeHTTP(wr, r) | |
| if wr.status == http.StatusNotFound { | |
| w.Header().Set("Content-Type", "text/html; charset=utf-8") | |
| w.WriteHeader(http.StatusNotFound) | |
| w.Write(h.page) | |
| return | |
| } | |
| w.WriteHeader(wr.status) | |
| io.Copy(w, &wr.buf) | |
| } | |
| type response struct { | |
| buf bytes.Buffer | |
| status int | |
| header http.Header | |
| } | |
| func (w *response) Write(p []byte) (int, error) { return w.buf.Write(p) } | |
| func (w *response) WriteHeader(status int) { w.status = status } | |
| func (w *response) Header() http.Header { return w.header } | |
| func main() { | |
| flag.Parse() | |
| // Parse the not found page. | |
| f, err := os.Open(filepath.Join(*root, "notfound.html")) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| page, err := ioutil.ReadAll(f) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| // Start the server. | |
| h := NotFoundHandler{http.FileServer(http.Dir(*root)), page} | |
| log.Fatal(http.ListenAndServe(*address, h)) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
awesome, thanks!