How to Create a Simple REST Server in Go

Below is an example on how to create a simple REST server in Go.

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

package main   import (     "encoding/json"     "log"     "net/http"     "strconv" )   type Hello struct {     Message string `json:"message"` }   func HelloServer(w http.ResponseWriter, req *http.Request) {     log.Println("Received a request from ", req.RemoteAddr)     w.Header().Set("Content-Type", "application/json")     if req.Method == "GET" {         encoder := json.NewEncoder(w)         hello := Hello{"Hello World"}         encoder.Encode(hello)     } }   func main() {     port := 8080     // serve static content     http.Handle("/", http.FileServer(http.Dir("html")))     http.HandleFunc("/hello/", HelloServer)     log.Println("Starting HTTP server at", port)     err := http.ListenAndServe(":"+strconv.Itoa(port), nil)     if err != nil {         log.Fatal("Unable to start the server: ", err)     } }

How to Cross Compile Go Programs

If you download the Go binary for a particular platform, most likely that go binary distribution does not come with support for cross-compiling.

cd myapp
GOOS=windows GOARCH=amd64 go build

go build runtime: windows/amd64 must be bootstrapped using make.bash

In order to add support for cross-compiling in your Go distribution, you need to do the following.

cd $GOROOT/src
GOOS=windows GOARCH=amd64 ./make.bash --no-clean

In this example I am adding cross-compile support to target Windows 64-bit.

cd myapp
GOOS=windows GOARCH=amd64 go build

Now you can easily build Windows 64-bit binaries on a Linux.