topic Re: "Unable to load /proxy/?http://localhost Statu 404 in ArcGIS JavaScript Maps SDK Questions

"Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Wed, 07 Dec 2016 20:25:15 GMT

Hello everyone,

I am getting the following error message

"Unable to load /proxy/?http://localhost/FindNextVALUENumber/api/value status: 404"

when running this sample:

https://developers.arcgis.com/javascript/3/jssamples/data_requestJson.html

When I pass these URLs, the first one works fine but the second one fails

url = "http://localhost:59297/api/value"; <ç========WORKS FINE – it is the Visual Studio 2012 proejct

url = "http://localhost/FindNextVALUENumber/api/value"; <ç==== FAILS – runs from IIS

The second URL is the IIS Application pointing to the same folder.

I am using the proxy server from this sample: https://github.com/Esri/resource-proxy

I tested both url and they work fine with the proxy:

http://localhost/proxy/proxy.ashx?http://localhost:59297/api/value

http://localhost/proxy/proxy.ashx? http://localhost/FindNextVALUENumber/api/value

Here is the proxy.config file

<serverUrl url="http://localhost:61004"

matchAll="true"/>

<serverUrl url="http://localhost:59297"

matchAll="true"/>

<serverUrl url="http://localhost"

matchAll="true"/>

</serverUrls>

</ProxyConfig>

My code:

esriConfig.defaults.io.proxyUrl = "/proxy/";

var url = "http://localhost:59297/api/value";

url = "http://localhost/FindNextVALUENumber/api/value";

dom.byId("url").value = url;

dom.byId("content").value = "";

//handle the Go button's click event

on(dom.byId("submitRequest"), "click", getContent);

var serviceDescriptionStr = "";

function getContent() {

var result = "";

var contentDiv = dom.byId("content");

contentDiv.value = "";

domClass.remove(contentDiv, "failure");

dom.byId("status").innerHTML = "Downloading...";

var requestHandle = esriRequest({

"url": url,

handleAs: "json"

});

requestHandle.then(

function (response) {

console.log("Data: ", response);

dojoJson.toJsonIndentStr = " ";

console.log("Success: ", response);

function (error) {

console.log("Error: ", error.message);

alert(error.message);

});

}

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Thu, 08 Dec 2016 14:27:26 GMT

Jose,

If you can not get the to run in a browser without running the service from your visual studio that is what you need to focus on first. The fact that you can not get your second url to work from the browser is an issue that will stop you in your tracks until you get that fixed (forget all the js and proxy stuff until you get that resolved).

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Thu, 08 Dec 2016 19:36:46 GMT

Thank you Robert

I am able to run "http://localhost:59297/api/value and http://localhost/FindNextVALUENumber/api/value in my Goodle browser and it works fine.

I also added alwaysUseProxy and updated proxyUrl with the whole path.

esriConfig.defaults.io.alwaysUseProxy = false;

esriConfig.defaults.io.proxyUrl = "http://localhost/proxy/proxy.ashx";

This is the error message I am getting:

XMLHttpRequest cannot load http://localhost/proxy/proxy.ashx?http://localhost/FindNextValueNumber/api/value. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:59297' is therefore not allowed access.
init.js:89 n {message: "Unable to load http://localhost/proxy/proxy.ashx?h…localhost/FindNextVALUENumber/api/value status: 0", response: Object, status: 0, responseText: "", xhr: XMLHttpRequest…}w @ init.js:89(anonymous function) @ init.js:88c @ init.js:103d @ init.js:103resolve.callback @ init.js:105c @ init.js:104d @ init.js:103reject.errback @ init.js:105c @ init.js:104d @ init.js:103reject.errback @ init.js:105c @ init.js:104d @ init.js:103reject.errback @ init.js:105(anonymous function) @ init.js:92h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109n @ init.js:138f @ init.js:143

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Thu, 08 Dec 2016 19:57:55 GMT

Jose,

what does your proxy.config look like?

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Fri, 09 Dec 2016 13:30:55 GMT

Hello

Here is a copy of the proxy.config

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

<serverUrl url="http://services.arcgisonline.com"

matchAll="true"/>

<serverUrl url="http://gisweb.miamidade.gov"

matchAll="true"/>

<serverUrl url="http://localhost:59297"

matchAll="true"/>-->

<serverUrl url="http://localhost/proxy/"

matchAll="true"/>

<serverUrl url="http://localhost/FindNextvalueNumber/"

matchAll="true"/>

<serverUrl url="http://localhost/proxy/"

matchAll="true"/>

<serverUrl url="http://[mycomputername]/FindNextvalueNumber/"

matchAll="true"/>

</serverUrls>

</ProxyConfig>

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Fri, 09 Dec 2016 13:48:46 GMT

Jose,

your urls used in your code and your proxy.config are CaSe sensitive so

does not match

http://localhost/FindNextVALUENumber/api/value

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Fri, 09 Dec 2016 14:23:33 GMT

Same error. See below:

XMLHttpRequest cannot load http://localhost/proxy/proxy.ashx?http://localhost/FindNextAASISNumber/api/aasis. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:59297' is therefore not allowed access.

init.js:89 n_ssl: undefinedlog: undefinedmessage: "Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value status: 0"response: ObjectresponseText: ""stack: "Error: Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/aasis status: 0↵ at new n (https://js.arcgis.com/3.18/init.js:111:353)↵ at XMLHttpRequest.f (https://js.arcgis.com/3.18/init.js:142:454)"status: 0xhr: XMLHttpRequest__proto__: Errorw @ init.js:89(anonymous function) @ init.js:88c @ init.js:103d @ init.js:103resolve.callback @ init.js:105c @ init.js:104d @ init.js:103reject.errback @ init.js:105c @ init.js:104d @ init.js:103reject.errback @ init.js:105c @ init.js:104d @ init.js:103reject.errback @ init.js:105(anonymous function) @ init.js:92h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109a @ init.js:108h @ init.js:107k @ init.js:107w.reject @ init.js:109n @ init.js:138f @ init.js:143

n
1. _ssl:undefined
2. log:undefined
3. message:"Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value status: 0"
4. response:Object
5. responseText:""
6. stack:"Error: Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value status: 0↵ at new n (https://js.arcgis.com/3.18/init.js:111:353)↵ at XMLHttpRequest.f (https://js.arcgis.com/3.18/init.js:142:454)"
7. status:0
8. xhr:XMLHttpRequest
9. __proto__:Error

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Fri, 09 Dec 2016 14:44:39 GMT

Jose,

Origin 'http://localhost:59297' is therefore not allowed access. So i am confused is your app running in Visual Studio?

My personal preference is to never use localhost in my urls. If you know your machine name then use it instead. When developing a RESTfull web service get it working in the web browser and once you are satisfied then deploy it to your web server for use in developing your js code.

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Fri, 09 Dec 2016 15:08:59 GMT

Hi Robert,

I created an "HtmlPage2.html" in my current Visual Studio project to test the code.

Now I just copied this page "HtmlPage2.html" to a new folder, and opened it with Google Chrome.

When I open the page this is the error I am getting:

XMLHttpRequest cannot load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value.

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

n
1. _ssl:undefined
2. log:undefined
3. message:"Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value status: 0"
4. response:Object
5. responseText:""
6. stack:"Error: Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value status: 0↵ at new n (https://js.arcgis.com/3.18/init.js:111:353)↵ at XMLHttpRequest.f (https://js.arcgis.com/3.18/init.js:142:454)"
7. status:0
8. xhr:XMLHttpRequest
9. __proto__:Error

HtmlPage2.html:111 Error: Unable to load http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value status: 0

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Fri, 09 Dec 2016 15:26:06 GMT

Jose,

What happen when you just put http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value in your browsers addresbar and hit enter?

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Fri, 09 Dec 2016 16:15:07 GMT

Robert,

Typing

http://localhost/proxy/proxy.ashx?http://localhost/FindNextVALUENumber/api/value

http://[mymachine]/proxy/proxy.ashx?http://[mymachine]/FindNextVALUENumber/api/value

Work fine.

It looks like https://js.arcgis.com is trying to open the link but it can't or it does not allowed.

The error persists pointing directly to my computer name instead of localhost

XMLHttpRequest cannot load http://jsancn-3/proxy/proxy.ashx?http://jsancn-3/FindNextVALUENumber/api/value. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

Object

responseText:""
stack:"Error: Unable to load http://jsancn-3/proxy/proxy.ashx?http://jsancn-3/FindNextVALUENumber/api/value status: 0↵ at new n (https://js.arcgis.com/3.18/init.js:111:353)↵ at XMLHttpRequest.f (https://js.arcgis.com/3.18/init.js:142:454)"
status:0

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Sat, 11 Dec 2021 22:26:25 GMT

Jose,

This is how I have code in my app that calls a RESTfull web service without that error:

        var requestHandle = esriRequest({
          url: 'my web service url and endpoint',
          content: {
            ppin: ppin,
            f: 'json'
          },
          handleAs: "json",
          timeout: 10000
        },{useProxy: true, usePost: false, disableIdentityLookup: true});

        requestHandle.then(lang.hitch(this, function(taxReportJSON){
        ....‍‍‍‍‍‍‍‍‍‍‍‍

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Fri, 09 Dec 2016 16:32:45 GMT

Hi Robert,

When do I have tdeclare a content part?

content: {
            ppin: ppin,
            f: 'json'
          }

This is my code, let me update it to match yours:

esriConfig.defaults.io.alwaysUseProxy = true;
esriConfig.defaults.io.proxyUrl = "http://jsancn-3/proxy/proxy.ashx";
var url = "http://jsancn-3/FindNextVALUENumber/api/value";

var requestHandle = esriRequest({
                    "url": url,
                   handleAs: "json"
                    //callbackParamName: "jsoncallback"

});
requestHandle.then(requestSucceeded, requestFailed);

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Fri, 09 Dec 2016 17:23:37 GMT

Jose,

If your web service does not take an input parameter then no you do not need the content part

Re: "Unable to load /proxy/?http://localhost Statu 404

JoseSanchez — Mon, 12 Dec 2016 13:14:39 GMT

It works now!

I just created an empty ASP.Net application, added html file "HtmlPage2.html", and used the "Internal Web Browser" to run the project. Selecting the HtmlPage2.html as "Set as Start Page" I was able to run it in Visual studio.

I am using URLs with my machine name instead of "localhost.

   var requestHandle = esriRequest({
                    "url": url,
                   handleAs: "json"

}, {useProxy: true, usePost: false, disableIdentityLookup: true});

requestHandle.then(requestSucceeded, requestFailed);

Re: "Unable to load /proxy/?http://localhost Statu 404

RobertScheitlin__GISP — Mon, 12 Dec 2016 13:22:39 GMT

Great, don't forget to mark this as answered.