Indy TIdHTTP POSTs getting slow responses

Posted on 2013-06-19
Last Modified: 2013-07-04
I am having a problem with a Delphi 5 app, utilising first Indy 9, and then Indy 10.

Components in use (Indy 9):
TIdHTTP, TIdConnectionIntercept & TIdSSLIOHandlerSocket.
Components in use (Indy 10):
TIdHTTP, TIdConnectionIntercept & TIdSSLIOHanlderSocketOpenSSL.
(SSL is in use, with no TIdAntiFreeze in use)

The problem the app is presently experiencing is slow responses (between 3 and 25 seconds) to TIdHTTP POSTs.

Based on assorted links, I have tried:
- setting ConnectTimeout to zero
- setting the HTTPOptions flag hoKeepOriginalProtocol
- upgraded from 9 to 10 (10.5.8 XE2)

As a test, I also tried using a test executable written in C# (HttpWebRequest), which gets split-second response times.

Is there anything else I can try with Indy 9/10 config?
Question by:brenlex
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Expert Comment

ID: 39261720
off the top of my head, it could be a certificate verification issue.
try disabling SSL, just to test if it makes any difference.

Author Comment

ID: 39262029
Not possible. Customer won't allow it.

Expert Comment

ID: 39262150
I didn't mean to disable SSL permanently or in the final product.
I meant to disable it temporarily, only to test if something changes.
If nothing changes, you have to look elsewhere.
If something changes, you'll know what to focus on.

Alternatively, you can use Wireshark to track the connection and see where's the bottleneck.
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Author Comment

ID: 39264747
I understand -- it would be easier to diagnose. Unfortunately the equipment to which I am attaching is only accessible via HTTPS -- out of my control.

I don't think Wireshark would work with SSL in place.

Accepted Solution

lomo74 earned 500 total points
ID: 39265016
What about stunnel + wireshark.

Author Closing Comment

ID: 39299787
In the end I just rewrote the app in C# - now no issues with speed. Have some points for the heads-up on stunnel -- handy one for next time.

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