[SOLVED] Unexpected time out when POSTing with Synapse
lazarus / 38-Networking and Web Programming

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eny · 2016-03-22 18:35

I'm using Synapse to send data to a REST server via SSL.
Class/method used is THTTPSend.HTTPMethod('POST', <url>);

This works very well for requests of any size that do not take longer
than 90 seconds to process.
However for any request that takes longer than 90 seconds to process
by the server, the call aborts with a return value of false and a
returncode of 0.
So I'm suspecting there is some sort of time out configured somewhere
in the Synapse lib, but I have not been able to find one.
Any clues to what might be going on?

Note that this does not look like a server side problem, because using
for example PHP to make the exact same call does work.
Server side time outs are set to 3 minutes.

Window$ 8.1; Lazarus 1.4.4 (32 bit); synapse 40; latest versions of
libeay32.dll and ssleay32.dll.

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rvk · 2016-03-22 19:06

You can find the 90 seconds in the source of Synapse:
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 constructor
THTTPSend.Create;begin  inherited Create;  //...  FTimeout := 90000;So
the only thing you have to do is
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
HTTPSend1.TimeOut := 180000; // or whatever you want

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eny · 2016-03-22 20:10

Quote from: rvk on March 22, 2016, 08:06:31 pmYou can find the 90
seconds in the source of Synapse:If things were always this simple
Thx for the push in the right direction.
This works.

Actually this is a bug in THTTPSend.Create: THTTPSend is a subclass of
TSynaClient and FTimeOut is a variable defined and initialized in
TSynaClient.
In there it is initialized with a value of 5000 and that is the value
I saw initially (and could not match with my 90 seconds time out).
This variable is defined as protected and overwritten in
THTTPSend.Create with 90000.
So there are no less than three bugs in only two lines of code:
FTimeout is defined as protected and not private, even though there
are public/published properties to access this field.THTTPSend.Create
is overwriting the initial value for no apparent reason (undocumented)
and ...... it does so by accessing the protected variable FTimeout,
not the property named Timeout.