[Solved] Cannot display socket header data in IdHTTPProxyServer
lazarus / 38-Networking and Web Programming

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loaded · 2020-01-29 14:00

Hello to everyone
I am using IdHTTPProxyServer included in Indy 10.6.2.5494 package.
The application runs smoothly, but to see the header data from the
users to the IdHTTPProxyServer1Connect method

when I add the code

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TForm1.IdHTTPProxyServer1Connect(AContext: TIdContext);begin 
 memo1.lines.add(AContext.Connection.Socket.ReadLn); //<-end; 
The project is inoperable. What could be the reason for this?
I would be glad if you can get the idea and help. Respects.

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Remy Lebeau · 2020-01-29 19:35

Why are you reading the client's request data in the
TIdHTTPProxyServer.OnConnect event?  You should not be doing that at
all.  You are reading the request line that specifies the HTTP method
and URL being requested by the client, which means that line is no
longer available for TIdHTTPProxyServer to read, so it won't know how
to process the request correctly.

If you want access to the client's request headers, you need to
either:

use the TIdHTTPProxyServer.OnHTTPBeforeCommand eventset the
TIdHTTPProxyServer.TransferMode property to tmFullDocument and use the
TIdHTTPProxyServer.OnHTTPDocument event
Either way, the client's request headers will be in the provided
TIdHTTPProxyServerContext object's Headers property when its
TransferSource property is tsClient.

Also, TIdHTTPProxyServer is a multi-threaded component.  Its events
are fired in the context of worker threads, not in the main UI
thread.  As such, you cannot safely access UI controls directly like
you are.  You MUST synchronize with the main UI thread, such as with
the RTL's TThread.Synhronize() or TThread.Queue() methods, or Indy's
TIdSync or TIdNotify classes.

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loaded · 2020-01-29 20:01

Thank you so much for your answer to Remy Lebeau.
I want to do;
Except for a single web resource I specified, it was to end incoming
connection requests.
So I thought the Onconnect method was appropriate.
I was wrong, the method you said worked. Also thank you for writing
Indy and for all your efforts. Respects.