topic Re: XMLHttpRequest cannot load....? in ArcGIS JavaScript Maps SDK Questions

XMLHttpRequest cannot load....?

ionarawilson1 — Thu, 23 Jan 2014 16:06:17 GMT

Why am I getting this message in the browser developer when I run an application?

XMLHttpRequest cannot load http://services.arcgisonline.com/ArcGIS/rest/info?f=json. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.

Re: XMLHttpRequest cannot load....?

JonathanUihlein — Thu, 23 Jan 2014 16:11:03 GMT

It looks like you may need to set up a proxy.

Re: XMLHttpRequest cannot load....?

ionarawilson1 — Thu, 23 Jan 2014 18:38:35 GMT

Hi Jon,

I added that line to my proxy page and I still have the issue, but just in Chrome, not in FF. Could it be that this is just a bug?

Here is another thread talking about it:

http://forums.arcgis.com/threads/60386-Access-Control-Allow-Origin-and-3.0?p=208466&viewfull=1#post208466

And here is the contents of my proxy. Am I doing something wrong or is this just something not to worry about like that other thread suggested? Thank you!

[HTML]
<?xml version="1.0" encoding="utf-8" ?>

<ProxyConfig mustMatch="false">
<serverUrls>
    
    <serverUrl url="http://sampleserver1.arcgisonline.com/arcgis/rest/services/"
               matchAll="true"></serverUrl>
    <serverUrl url="http://sampleserver2.arcgisonline.com/arcgis/rest/services/"
               matchAll="true"
               token=""></serverUrl>
    <serverUrl url="http://server.arcgisonline.com/arcgis/rest/services/"
               matchAll="true"></serverUrl>
    <serverUrl url="http://orthogonal.esri.com/arcgis/rest/services/"
               matchAll="true"></serverUrl>
    <serverUrl url="http://hummer/ArcGIS/rest/services"
               matchAll="true"
               dynamicToken="true"></serverUrl>

<serverUrl url="http://tfsgis-iisd01:6080/arcgis/rest/services/Utilities/Geometry/GeometryServer"
               matchAll="true"></serverUrl>
</serverUrls>

</ProxyConfig>

[/HTML]

Re: XMLHttpRequest cannot load....?

derekswingley1 — Thu, 23 Jan 2014 19:55:03 GMT

Why am I getting this message in the browser developer when I run an application?

XMLHttpRequest cannot load http://services.arcgisonline.com/ArcGIS/rest/info?f=json. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.

This happens because the server in question (services.arcgisonline.com) does not support CORS. This has been discussed quite a bit in these forums and the thread you linked (a previous post of mine) is relevant. More information here: http://forums.arcgis.com/threads/94219-Disable-CORS-Discussion

You can ignore this error. If you want to make it go away, turn off CORS detection:

require(["esri/config"], function(esriConfig) {   esriConfig.defaults.io.corsDetection = false; });

Re: XMLHttpRequest cannot load....?

ionarawilson1 — Thu, 23 Jan 2014 20:14:44 GMT

Thank you Derek! It is nice not to have that error anymore!

Re: XMLHttpRequest cannot load....?

PrithvirajShunmugham — Thu, 18 Jan 2024 06:42:39 GMT

Hello @derekswingley1 , I'm new to esri community. Currently i developing the web app from webapp builder developer edition,I deployed and run through local machine, im facing the same error which has faced by @ionarawilson1. could you please help me out to solve this issue.

Below error screenshot which i currently facing