Microsoft Dynamics 365 | Integration, Dataverse...

Plugin REST API integration/Call

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Posted on by Community Member

Hi guys,

I have a bit of a weird problem here.

Scenario:

I need to make Calls to an external REST API from inside Dynamics 365 online. Wrote a test console app and I am able to make all the necessary calls to the external REST API.

The moment I make that a Plugin and register on D365, nothing works.

I get the below error:

“A Web exception occurred while attempting to issue the request. Unable to connect to the remote server”

I contacted the third party and they confirmed that the port they are using is port 443.

Any ideas?

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a33ik 84,331 Most Valuable Professional on at

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Hello,

Can you please provide the code you use?

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try { using (WebClient client = new WebClient()) { client.Headers.Add("Authorization", "Bearer Token Value"); client.Headers.Add(HttpRequestHeader.ContentType, "application/json"); byte[] responseBytes = client.DownloadData("">api-XXXXXXXX.com/.../00"); string response = Encoding.UTF8.GetString(responseBytes); tracer.Trace("Response : " response); } } catch (WebException exception) { string str = string.Empty; if (exception.Response != null) { using (StreamReader reader = new StreamReader(exception.Response.GetResponseStream())) { str = reader.ReadToEnd(); } exception.Response.Close(); } if (exception.Status == WebExceptionStatus.Timeout) { throw new InvalidPluginExecutionException( "The timeout elapsed while attempting to issue the request.", exception); } throw new InvalidPluginExecutionException(String.Format(CultureInfo.InvariantCulture, "A Web exception occurred while attempting to issue the request. {0}: {1}", exception.Message, str), exception); }

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Apologies, Tried formatting the code snippet, didn't win.

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a33ik 84,331 Most Valuable Professional on at

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No worries, I fixed the formatting.

I remember having similar issues when I used WebClient. Check this post - stackoverflow.com/.../call-external-api-from-microsoft-dynamics-365-online

I remember that using of HttpWebRequest/HttpWebResponse fixed the issue.

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Thanks for this, appreciated.

There clearly is something totally wrong here. I used HttpWebRequest/HttpWebResponse (In console) works perfectly. deploy plugin, still getting my initial error "Unable to connect to remote server"

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://apiXXXXXX.com/.../00"); request.ContentType = "application/json"; request.Method = "GET"; request.Timeout = 500000; request.Headers.Add("Authorization", "Bearer Token Value"); var response = (HttpWebResponse)request.GetResponse(); string content = string.Empty; using (var stream = response.GetResponseStream()) { using (var sr = new StreamReader(stream)) { content = sr.ReadToEnd(); } } tracer.Trace("Response : " content);

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a33ik 84,331 Most Valuable Professional on at

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Hello,

I would recommend to get in touch with API provider and ask if there is a need to whitelist IP addresses of Dynamics because the call to their API comes from it.

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