From 0ab996d01cecbe2e6a6567c16f65510d785a8e4b Mon Sep 17 00:00:00 2001
From: Ansis Brammanis <ansis@mapbox.com>
Date: Mon, 22 Jan 2018 14:08:58 -0500
Subject: [PATCH] improve ajax error messages

A failed GeoJSON load now logs
`AJAXError: Not Found (404): http://example.com/asdf.geojson`
instead of
`Error`
---
 src/util/ajax.js | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/util/ajax.js b/src/util/ajax.js
index 04ffa8e1580..f39cb83dc40 100644
--- a/src/util/ajax.js
+++ b/src/util/ajax.js
@@ -42,9 +42,19 @@ export type RequestParameters = {
 
 class AJAXError extends Error {
     status: number;
-    constructor(message: string, status: number) {
+    url: string;
+    constructor(message: string, status: number, url: string) {
         super(message);
         this.status = status;
+        this.url = url;
+
+        // work around for https://github.com/Rich-Harris/buble/issues/40
+        this.name = this.constructor.name;
+        this.message = message;
+    }
+
+    toString() {
+        return `${this.name}: ${this.message} (${this.status}): ${this.url}`;
     }
 }
 
@@ -75,7 +85,7 @@ exports.getJSON = function(requestParameters: RequestParameters, callback: Callb
             }
             callback(null, data);
         } else {
-            callback(new AJAXError(xhr.statusText, xhr.status));
+            callback(new AJAXError(xhr.statusText, xhr.status, requestParameters.url));
         }
     };
     xhr.send();
@@ -100,7 +110,7 @@ exports.getArrayBuffer = function(requestParameters: RequestParameters, callback
                 expires: xhr.getResponseHeader('Expires')
             });
         } else {
-            callback(new AJAXError(xhr.statusText, xhr.status));
+            callback(new AJAXError(xhr.statusText, xhr.status, requestParameters.url));
         }
     };
     xhr.send();