jobqueue/api: don't panic when error cannot be returned

Don't panic when the error message cannot be written to the connection.
Ignore it, because there's nothing we can do in this case. The standard
library has the same behavior.

internal/jobqueue/api.go

@@ -2,6 +2,7 @@ package jobqueue
 
 import (
 	"encoding/json"
+	"fmt"
 	"log"
 	"net"
 	"net/http"
@@ -66,21 +67,19 @@ func notFoundHandler(writer http.ResponseWriter, request *http.Request) {
 	writer.WriteHeader(http.StatusNotFound)
 }
 
-func statusResponseError(writer http.ResponseWriter, code int, errors ...string) {
+func statusResponseError(writer http.ResponseWriter, code int, message string) {
 	writer.WriteHeader(code)
 
-	for _, err := range errors {
-		_, e := writer.Write([]byte(err))
-		if e != nil {
-			panic(e)
-		}
+	if message != "" {
+		// ignore error, because we cannot do anything useful with it
+		fmt.Fprint(writer, message)
 	}
 }
 
 func (api *API) addJobHandler(writer http.ResponseWriter, request *http.Request, _ httprouter.Params) {
 	contentType := request.Header["Content-Type"]
 	if len(contentType) != 1 || contentType[0] != "application/json" {
-		statusResponseError(writer, http.StatusUnsupportedMediaType)
+		statusResponseError(writer, http.StatusUnsupportedMediaType, "")
 		return
 	}
 
@@ -106,7 +105,7 @@ func (api *API) addJobHandler(writer http.ResponseWriter, request *http.Request,
 func (api *API) updateJobHandler(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
 	contentType := request.Header["Content-Type"]
 	if len(contentType) != 1 || contentType[0] != "application/json" {
-		statusResponseError(writer, http.StatusUnsupportedMediaType)
+		statusResponseError(writer, http.StatusUnsupportedMediaType, "")
 		return
 	}