nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

XMLHttpRequest cannot load....?

WilsonIonara

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.

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Accepted answers

derekswingley1

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; });

All comments

PrithvirajShunmugham

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

WilsonIonara

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

derekswingley1

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.

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

WilsonIonara

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]

JonathanUihlein

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

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