Delphi IWinHTTPRequest SetRequestHeader

Asked Mar 21 '19 at 20:07

Active Mar 21 '19 at 21:42

Viewed 528 times

I am trying to send custom header values in a HTTP POST but the site I am posting to tells me they are just receiving nulls.

I have tried setting the values OSName, OSVersion, ProductName, ProductVersion as a String, WideString and OLEVariant, but no matter how I send the values, they arrive as a null.

This is how they are being set. Yes I have verified that the values (OSName, etc) do have values.

HTTPOb := CoWinHttpRequest.Create; 
HTTPOb.SetTimeouts(RESOLVETIMEOUT,CONNECTTIMEOUT,SENDTIMEOUT,RECEIVETIMEOUT);

URL := sServer;
HTTPOb.Open(bStrMethod, URL, false);
HTTPOb.SetRequestHeader('MAXM_HOST_OS_NAME', OSName);
HTTPOb.SetRequestHeader('MAXM_HOST_OS_VER', OSVersion);
HTTPOb.SetRequestHeader('MAXM_HOST_APP_NAME', ProductName);
HTTPOb.SetRequestHeader('MAXM_HOST_APP_VER', ProductVersion);

HTTPOb.Send(xml);

edited Mar 21 '19 at 21:42

Remy Lebeau

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asked Mar 21 '19 at 20:07

user3396999

did you verify with a packet sniffer like Wireshark, or a debugging proxy like Fiddler, that the values are actually being transmitted in the HTTP request? If they are, and they are still null on the receiving side, then the problem is on the receiving side, not yours. – Remy Lebeau Mar 21 '19 at 21:43
Thank you Remy - I have in the past but was not successful. Communication is thru a VPN and I have not been able to see the output – user3396999 Mar 22 '19 at 10:15
you can run Wireshark/Fiddler on the same machine as your client, even if the server is reached through a VPN. – Remy Lebeau Mar 22 '19 at 16:28
Which Delphi Version are you using ? – Hugues Van Landeghem Mar 25 '19 at 20:26
Using Delphi RIO 10.3 – user3396999 Apr 15 '19 at 11:12

Delphi IWinHTTPRequest SetRequestHeader

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