How to send POST request to a third-party website using x++?

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Posted on by Arif Hussain

155

Hi experts,

I have built a .NET library project for getting an access token for an integration with a third party and I have added the dll file in my D365FO project. I am now trying to use that access token and sending a POST request from x++ to that third party URL but I am getting 400 bad request error in my response.

I have also tested in postman and it's working fine.

Here is my code and anyone please share your valuable suggestion of what I am doing wrong.

public static void main(Args _args)
{
//Library class for getting access token
AADAuthClient.Program program = new AADAuthClient.Program();

   System.Net.WebClient webClient;
   System.Net.WebHeaderCollection headers;
   System.Net.HttpWebRequest request;
   System.Net.HttpWebResponse response;
   str requestBody;
   str responseBody;

   try
   {
       // Create the authentication client
       str accessToken = program.getAccessTokenAsync(tokenEndPoint, clientId, clientSecret);

       if (!accessToken)
       {
           error(/Access token retrieval failed./);
           return;
       }

headers = new System.Net.WebHeaderCollection();

// Add the access token to the request headers
headers.Add(/Authorization/, /Bearer / + accessToken);

headers.Add(/Content-Type/, /application/json/);

       // Set the request URL
       str apiUrl = /URI/; // Replace with your API endpoint URL
       // Create the HTTP request
       request = System.Net.WebRequest::Create(apiUrl) as System.Net.HttpWebRequest;
       //request.set_Headers(headers);
       request.Method = 'POST';

       //This part is for sending json body
       JSONContract contract = new JSONContract();
       contract.parmBOMId(/string/);
       contract.parmCustRef(/string/);
       //This is a class for handling JSON
       JsonParser jsonParser = new JsonParser();
       str jsonBody = jsonParser.objtoJson(contract);

       using (var streamWriter = new System.IO.StreamWriter(request.GetRequestStream()))
       {
           streamWriter.Write(jsonBody);
           streamWriter.Flush();
       }

// Send the request
response = request.GetResponse();

// Read and process the response
responseBody = response.GetResponseStream().ToString();

//System.IO.StreamReader streamRead;
//streamRead = new System.IO.StreamReader(response.GetResponseStream());

       info(/API Response: / + responseBody);
       info(/jsonBody: / + jsonBody);
   }
   catch (Exception::Error)
   {
       error(/An error occurred during authentication or the HTTP request: /); //+ errorTextGet());
   }
}

I will be very thankful to you.

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Answers (1)

Arif Hussain 155 on at

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How to send POST request to a third-party website using x++?

Sir Martin Dráb,

Thank you for your kind response. I really tried to paste the code inside code snippet but it was coming all in one line, I do not know why. I also tried to correct the spaces as well but still it was difficult for me that's why I pasted the code in simple way.

Btw sir, I figured it out, I was not sending the correct json body for which it was giving error in request.GetResponse().

Yeah, it's my mistake I did not commend out the set_headers part. I was just debugging and commented that for testing purpose and I forgot to comment it out.

Btw, thank you so much again sir. You have always helped me for which I really appreciate.

Sir, I also want you to help me in my this question please. I have still confusion in that.

Here is the link.
https://community.dynamics.com/forums/thread/details/?threadid=8db8f1aa-fc5c-ee11-be6f-00224827e220
Verified answer

Martin Dráb 230,503 Most Valuable Professional on at

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How to send POST request to a third-party website using x++?

Let's start by making your code easier to read.
public static void main(Args _args) { //Library class for getting access token AADAuthClient.Program program = new AADAuthClient.Program(); try { // Create the authentication client str accessToken = program.getAccessTokenAsync(tokenEndPoint, clientId, clientSecret); if (!accessToken) { throw error("Access token retrieval failed."); return; } System.Net.WebHeaderCollection headers = new System.Net.WebHeaderCollection(); // Add the access token to the request headers headers.Add("Authorization", "Bearer " + accessToken); headers.Add("Content-Type", "application/json"); // Set the request URL str apiUrl = "URI"; // Replace with your API endpoint URL // Create the HTTP request System.Net.HttpWebRequest request = System.Net.WebRequest::Create(apiUrl) as System.Net.HttpWebRequest; //request.set_Headers(headers); request.Method = 'POST'; //This part is for sending json body JSONContract contract = new JSONContract(); contract.parmBOMId("string"); contract.parmCustRef("string"); //This is a class for handling JSON JsonParser jsonParser = new JsonParser(); str jsonBody = jsonParser.objtoJson(contract); using (var streamWriter = new System.IO.StreamWriter(request.GetRequestStream())) { streamWriter.Write(jsonBody); streamWriter.Flush(); } // Send the request System.Net.HttpWebResponse response = request.GetResponse(); // Read and process the response str responseBody = response.GetResponseStream().ToString(); //System.IO.StreamReader streamRead; //streamRead = new System.IO.StreamReader(response.GetResponseStream()); info(strFmt("API Response: %1", responseBody)); info(strFmt("jsonBody: %1", jsonBody)); } catch (Exception::Error) { error(/An error occurred during authentication or the HTTP request: /); //+ errorTextGet()); } }

Now please tell us where the exception is thrown. I'm assuming it's either somewhere in getAccessTokenAsync(), or in request.GetResponse().

By the way, I noticed that you created headers, but you aren't using them (because the call of set_Headers() is commented out. You suggested that the authentication in required, therefore this must be a bug.