Added: downloading and returning wikipedia articles

api/httpio/httperror.go

@@ -0,0 +1,24 @@
+package httpio
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type HTTPError struct {
+	StatusCode int    `json:"-"`
+	ErrorCode  string `json:"error-code"`
+	Message    string `json:"message"`
+}
+
+func (h HTTPError) Raise(w http.ResponseWriter) {
+	jsonBytes, _ := json.Marshal(h)
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(h.StatusCode)
+	w.Write(jsonBytes)
+}
+
+func RaiseOnlyStatusCode(w http.ResponseWriter, code int) {
+	http.Error(w, "", code)
+}