ebay api via System.Net.HttpWebRequest (POST body information)

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Hello,

I am in the process of building an API for Ebay interfaces. I need to send some client credentials in the "body":

grant_type=client_credentials&scope=api.ebay.com/.../api_scope

I use the class System.Net.HttpWebRequest.

However, I don't know how to post something in the body. Can anyone here possibly help me how I could simply implement it?

I have attached a code snippet:

private str sExecuteRequest(str _sSubURL, str _sRESTMethod, System.Net.WebHeaderCollection _oHeader)
{
    str                           sResponse;
    System.Net.HttpWebRequest     oRequest;
    System.Net.HttpWebResponse    oResponse;
    System.Net.

//   System.Net.NetworkCredential  oCredentials;
    System.IO.StreamReader        oReader;
    System.IO.Stream              oDataStream;

    CLRObject                     oClrObj;
    ;

    oClrObj = System.Net.WebRequest::Create(_sSubURL);
    oRequest = oClrObj;

//Create Header 
    oRequest.set_Method(_sRESTMethod);

    oRequest.set_Headers(_oHeader);
    oRequest.set_ContentType(#HeaderContentType);
    oRequest.set_Accept(#HeaderContentAccept);

 //   "grant_type", "client_credentials&scope=https://api.ebay.com/oauth/api_scope"

    oResponse = oRequest.GetResponse();
    oDataStream = oResponse.GetResponseStream();
    oReader = new System.IO.StreamReader(oDataStream);
    sResponse = oReader.ReadToEnd();

    oReader.Close();
    oDataStream.Close();
    oResponse.Close();

    return sResponse;
}

I get the error message above the tool Fiddler:

{"error":"unsupported_grant_type","error_description":"grant type in request is not supported by the authorization server"}

Thank you in advance.

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Martin Dráb 239,451 Most Valuable Professional on at

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It seems that you're trying to get an authentication token and the body should look like this (not like what you have in your comment):

{ "grant_type" : "client_credentials", "scope" : "https://api.ebay.com/oauth/api_scope" }

But you don't seem to be setting any body at all. Use oRequest.GetRequestStream() to get a stream and write the data there, before calling GetResponse().

By the way, you're calling Close() on resource if everything ends successfully, but you won't close them if an exception occurs.

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Community Member on at

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Exactly. First, i need for a authorisation token, which I use for an access token.

According to Ebay customer service:

"I checked the logs and provided request body details and I found grant_type & scope list value is not correct.

Please specify grant_type and scope correctly.

Ex. grant_type=client_credentials&scope=api.ebay.com/.../api_scope

Best Regards,

eBay Developer Support"

... The grant type and scope should look like this. I have now adjusted the code and according to the tool Fiddler, an http message: 200 (OK) comes back. However, I noticed in the debugger, that the execute "oResponse = oRequest.GetResponse();" the AX hangs on.

If I lower the "Timeout", then the connection breaks prematurely.

[About the "exception": This method is called by another method and is in a "try/catch clause".

I have attached the revised code:

private str sExecuteRequest(str _sSubURL, str _sRESTMethod, System.Net.WebHeaderCollection _oHeader) { str sResponse; str sBody = "grant_type=client_credentials&scope=https://api.ebay.com/oauth/api_scope"; System.Net.HttpWebRequest oRequest; System.Net.HttpWebResponse oResponse; System.Net.HttpWebResponse oResponseM; System.IO.StreamReader oReader; System.IO.Stream oDataStream, ORequestStream; System.Exception oError; System.Text.Encoding utf8; System.Byte[] byteArray; CLRObject oClrObj; ; //Create Web-Object System.Net.ServicePointManager::set_SecurityProtocol(System.Net.SecurityProtocolType::Ssl3); oClrObj = System.Net.WebRequest::Create(_sSubURL); oRequest = oClrObj; //Create Header oRequest.set_Method(_sRESTMethod); oRequest.set_KeepAlive(false); oRequest.set_Headers(_oHeader); oRequest.set_ContentType(#HeaderContentType); oRequest.set_Accept(#HeaderContentAccept); oRequest.set_Timeout(10000); utf8 = System.Text.Encoding::get_UTF8(); byteArray = utf8.GetBytes(sBody); ORequestStream = oRequest.GetRequestStream(); ORequestStream.Write(byteArray, 0, byteArray.get_Length()); //Execute Request and Response oResponse = oRequest.GetResponse(); oDataStream = oResponse.GetResponseStream(); oReader = new System.IO.StreamReader(oDataStream); sResponse = oReader.ReadToEnd(); oReader.Close(); oDataStream.Close(); oResponse.Close(); CodeAccessPermission::revertAssert(); return sResponse; }

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