Hi to all,
I've a serious problem with Indy (9.0.18) and following system:
Computer A (CA):
- Indy HTTP Client
- Proxy enabled
Computer B (CB):
- Indy HTTP Server
- Direct connection to a dial-up ISP (56K)
The (CA) send a lot of very short requests to (CB)
between Indy HTTP Client, enabled to work with a
proxy which don't require any password and username.
The only HTTP command used is GET and the request is
very simple:
- FHTTP.Get('/?method=GetTime);
The (CB), in the HTTPServer OnCommandGet, parse the request
object and fill the response with:
- AResponseInfo.ResponseNo := 200;
- AResponseInfo.ContentText := IntToStr(timeGetTime);
- AResponseInfo.ContentType := 'text/html';
- AResponseInfo.ContentLength := Length(AResponseInfo.ContentText);
All seem work fine, but at very very low speed, about 300-500ms for
a single GET request.
I've tried to overload the Server work in (CB) with a simultaneous call
of many CA instances (32) and I can see the MODEM data flow increase
but the response timing is always the same (this is been useful
to undestand that mine isn't a problem of low modem throughput
but only an effect of continuos: connect to server, disconnect from server.
At this point I've inserted in my client in (CA) the following lines:
- FHTTP.Request.Connection := 'keep-alive';
- FHTTP.Request.ProxyConnection := 'keep-alive';
to enable the keep-alive mode in client side.
The speed results aren't unfortunately changed again, so
I've tried to set the KeepAlive property of Server in (CB) with
FHTTPServer.KeepAlive := True;
but results are the same.
I've tried again to insert in HTTPServer OnCommandGet the
following lines:
- AResponseInfo.Response.Connection := 'keep-alive';
- AResponseInfo.Response.ProxyConnection := 'keep-alive';
but results are same again.
I've tried to debug INDY source step-by-step and I've
saw that in my:
FHTTP.Response.Connection I've found a '' (empty string);
FHTTP.Response.ProxyConnection I've found a 'close';
What I've to do to obtain a persistent connection by my
HTTP Client in (CA) and HTTP Server in (CB) ?
Thank you very much....
Silverio Diquigiovanni
