HTTP requests to On-Premise Web API

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Posted on by Community Member

Hello,

I've seen a number of questions posted about how to execute Web API requests via HTTP external to the CRM, but I still am very unclear how to do this. It's rather frustrating that I can simply navigate to the ".../api/data/v8.0/" end point in my browser, but can't seem to access this via any other method. In PowerShell, I've tried the following code:

$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Accept", 'application/json')
$headers.Add("OData-MaxVersion", '4.0')
$headers.Add("OData-Version", '4.0')

Invoke-WebRequest -Uri 'crmtest.regent.edu/.../v8.0' -Headers $headers -Credential Get-Credential

But I get this error:

Invoke-WebRequest : The underlying connection was closed: An unexpected error 
occurred on a send.
At line:6 char:1
+ Invoke-WebRequest -Uri 
'crmtest.regent.edu/.../v8.0 ...
+ 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpW 
   ebRequest) [Invoke-WebRequest], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell 
   .Commands.InvokeWebRequestCommand

I've tried the Invoke-RestMethod as well. Similar requests in JavaScript don't seem to yield requests either.

What am I doing wrong?

Many thanks,

Daniel Hines

Regent University

Christian Leadership to Change the World

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joman 617 on at

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First of all, check your URL in CRM -> Parameters -> Settings -> Resources for developers.

Then check this: msdn.microsoft.com/.../gg334279.aspx

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Gopalan Bhuvanesh 11,401 on at

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Hi

This (Invoke-WebRequest -Uri 'crmtest....) should work.

Please check the URL (Example: crmtest.regent.edu/.../accounts) in the browser.

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Community Member on at

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Thank you both for the responses. I was able to working in Powershell; however, I haven't been able to do so in Javascript.

$(function () { $.ajax ({ type: "GET", url: "rctrdevcrm.regent.edu/.../v8.0", dataType: 'json', async: false, headers: { "Authorization": "Basic " + btoa(USERNAME + ":" + PASSWORD) }, success: function (res) { console.dir(res); }, }).fail(function (e) { console.dir(e); }) });

Here's the error I'm getting:

XMLHttpRequest cannot load rctrdevcrm.regent.edu/.../v8.0. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8080' is therefore not allowed access.

Why can I navigate straight to the page in the browser, or access the data with PowerShell, Power BI, etc., but not via XMLHttpRequest?

Thanks in advance,

Daniel Hines

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joman 617 on at

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Good day. You make cross-domain request, so browser don't do it.

You need to make a server, witch you are sending a request, give you a cookie, that allow cross-domain requests.

More info:

developer.mozilla.org/.../Access_control_CORS

or google: Access-Control-Allow-Origin

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Community Member on at

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Thank you for the links. Is this something I can configure on an on-premise instance of Dynamics CRM 2016 (not IFD)?

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