fix: handle error raised by request failure (#409)

- copy error.code and error.message when error is raised by a request
  failure

Author: leeyeh

src/request.js

@@ -204,37 +204,37 @@ const cacheServerURL = (serverURL, ttl) => {
 };
 
 // handle AV._request Error
-const handleError = (res) => {
-  const promise = new AVPromise();
-  /**
-    When API request need to redirect to the right location,
-    can't use browser redirect by http status 307, as the reason of CORS,
-    so API server response http status 410 and the param "location" for this case.
-  */
-  if (res.statusCode === 410) {
-    cacheServerURL(res.response.api_server, res.response.ttl).then(() => {
-      promise.resolve(res.response.location);
-    }).catch((error) => {
-      promise.reject(error);
-    });
-  } else {
-    let errorJSON = { code: -1, error: res.responseText };
-    if (res.response && res.response.code) {
-      errorJSON = res.response;
-    } else if (res.responseText) {
-      try {
-        errorJSON = JSON.parse(res.responseText);
-      } catch (e) {
-        // If we fail to parse the error text, that's okay.
+const handleError = (error) => {
+  return new AVPromise((resolve, reject) => {
+    /**
+      When API request need to redirect to the right location,
+      can't use browser redirect by http status 307, as the reason of CORS,
+      so API server response http status 410 and the param "location" for this case.
+    */
+    if (error.statusCode === 410) {
+      cacheServerURL(error.response.api_server, error.response.ttl).then(() => {
+        resolve(error.response.location);
+      }).catch(reject);
+    } else {
+      let errorJSON = {
+        code: error.code || -1,
+        error: error.message || error.responseText
+      };
+      if (error.response && error.response.code) {
+        errorJSON = error.response;
+      } else if (error.responseText) {
+        try {
+          errorJSON = JSON.parse(error.responseText);
+        } catch (e) {
+          // If we fail to parse the error text, that's okay.
+        }
       }
-    }
 
-    // Transform the error into an instance of AVError by trying to parse
-    // the error string as JSON.
-    const error = new AVError(errorJSON.code, errorJSON.error);
-    promise.reject(error);
-  }
-  return promise;
+      // Transform the error into an instance of AVError by trying to parse
+      // the error string as JSON.
+      reject(new AVError(errorJSON.code, errorJSON.error));
+    }
+  });
 };
 
 const setServerUrl = (serverURL) => {