英文:
How do I get GoLang's http.HandleFunc() to work without error?
问题
我正在尝试创建一个GoLang的http.HandleFunc()函数，用于监听POST请求并解析JSON文件。但是，这个处理程序在启动时出现错误并返回一个错误信息：
> 2017/01/24 13:35:08 listen tcp :8080: bind: Only one usage of each
> socket address (protocol/network address/port) is normally permitted.
我猜测这是一个致命错误。
以下是我的函数代码：
http.HandleFunc("/", func(w http.ResponseWriter, request *http.Request) {//debugfmt.Fprintf(w, "Hello, %q", html.EscapeString(request.URL.Path))var m Messageif request.Body == nil {http.Error(w, "Please send a request body", 400)return}err := json.NewDecoder(request.Body).Decode(&m)if err != nil {http.Error(w, err.Error(), 400)return}})log.Fatal(http.ListenAndServe(":8080", nil))
请问如何使这个处理程序正常工作，避免出现错误？
英文:
I am trying to create a GoLang http.HandleFunc() that will listen for post requests and parse a json file. The Handler seems to fail as it starts and returns an error:
> 2017/01/24 13:35:08 listen tcp :8080: bind: Only one usage of each
> socket address (protocol/network address/port) is normally permitted.
I am assuming that it is throwing a fatal error.
Below is my function:
http.HandleFunc("/", func(w http.ResponseWriter, request *http.Request) {//debugfmt.Fprintf(w, "Hello, %q", html.EscapeString(request.URL.Path))var m Messageif request.Body == nil {http.Error(w, "Please send a request body", 400)return}err := json.NewDecoder(request.Body).Decode(&m)if err != nil {http.Error(w, err.Error(), 400)return}})log.Fatal(http.ListenAndServe(":8080", nil))
How can I get this Handler to work and not get the error?
答案1
得分: 1
我已经修复了你的代码中的一些问题，并根据缺失的信息做出了最佳猜测。以下是一个示例工作代码，它将接受一个具有"name"和"text"字段的消息：
package mainimport ("encoding/json""fmt""html""log""net/http")type Message struct {Name string `json:"name"`Text string `json:"text"`}func main() {http.HandleFunc("/", func(w http.ResponseWriter, request *http.Request) {fmt.Fprintf(w, "Hello, %q", html.EscapeString(request.URL.Path))var m Messageif request.Body == nil {http.Error(w, "Please send a request body", 400)return}err := json.NewDecoder(request.Body).Decode(&m)if err != nil {http.Error(w, err.Error(), 400)return}log.Println(m)})log.Fatal(http.ListenAndServe(":8080", nil))}
希望对你有帮助！
英文:
I've remedied several of the problems with your code and made best guesses around missing information. Here is sample working code that will accept a message that has "name" and "text" fields:
package mainimport ("encoding/json""fmt""html""log""net/http")type Message struct {Name string `json:"name"`Text string `json:"text"`}func main() {http.HandleFunc("/", func(w http.ResponseWriter, request *http.Request) {fmt.Fprintf(w, "Hello, %q", html.EscapeString(request.URL.Path))var m Messageif request.Body == nil {http.Error(w, "Please send a request body", 400)return}err := json.NewDecoder(request.Body).Decode(&m)if err != nil {http.Error(w, err.Error(), 400)return}log.Println(m)})log.Fatal(http.ListenAndServe(":8080", nil))}
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