BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Synapse httpserv doesn't "talk" with Synapse clients Goto page 1, 2, 3, 4  Next          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Tim Robbins Guest Posted: Mon Dec 05, 2005 12:00 am    Post subject: Synapse httpserv doesn't "talk" with Synapse clients I found some strange behaviors in trying to set up some preliminary performance tests. In particular, I wanted to hammer a minor server with automated local requests, either on the same machine or on the local network. To my great surprise using Synapse clients to access a Synapse server did not work (at least here and now...), although the few other combinations I tried DID work (Internet Explorer (IE) to Synapse; Indy to Synapse; Synapse to Indy...). Even stranger: while waiting for a simple HttpGetText() to complete (which just hangs until the timeout, either on the same machine or from another on the local net)... if you SHUT DOWN the httpserv demo while the client's still waiting, the client immediately completes, reacting to the shutdown, instead of waiting for the timeout. BTW, if HttpGetText() (and HTTPMethod() etc.) time out, the routines STILL return reporting a SUCCESSFUL result value. This doesn't seem right. I'd love to hear what I'm doing wrong! Back to top theo Guest Posted: Mon Dec 05, 2005 10:52 am    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Quote: I'd love to hear what I'm doing wrong! First, you're asking in the wrong forum. Ask or search for a solution in the Synapse mailinglist. See here for instructions: http://sourceforge.net/mail/?group_id=125224 Back to top Tim Robbins Guest Posted: Mon Dec 05, 2005 3:05 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients theo wrote: Quote: Ask or search for a solution in the Synapse mailinglist. Sorry. I'm not allowed to use mailing lists. At this point, the right solution might be to go to a commercial library anyway. Back to top Tim Robbins Guest Posted: Mon Dec 05, 2005 6:37 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Theo, I went through the SourceForge Synapse email archive, and didn't find anything pertinent. Since there is some Synapse discussion in this newsgroup (and you and Tony constantly recommend Synapse), I'd like to continue this topic here, if anyone is willing. I'd be very interested if anyone else here using Synapse has seen the same behavior (that the http client can't communicate with the http server). The *extremely* simple and quickly set up test that I used was to run the (fixed) httpserv program and then run another simplistic program (either on the same or another computer) that just tries to get the most basic response. Basically: (substituting another address where appropriate) success := HttpGetText('127.0.0.1', StringList); As stated in the first posting in this thread: that call always fails either by timing out (unless the server is shut down while waiting) or recently somewhat faster, but though it fails it reports success. All other means of communicating with the server (IE, Indy, telnet...) work! That's very odd... and raises a lot of concern... Using (Synapse client) HttpGetText() to talk with the Indy server demo... works! A one-liner Indy client easily "talks" with the Synapse server demo: procedure TForm1.Button1Click(Sender: TObject); begin Memo1.Lines.text := IdHTTP1.Get('127.0.0.1'); end; BUT, no joy on the Synapse to Synapse conversation!! Back to top theo Guest Posted: Mon Dec 05, 2005 8:00 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Hmm, sounds strange indeed. To put some light in it, you should try to get the Socket Status event at least in the client. like: fHTTP.Sock.OnStatus:=Status; (See Below) This will show you where it hangs: you can print the state(s) with the help of this const SocketReasonStrings: array[0..13] of string = ('ResolvingBegin', 'ResolvingEnd', 'SocketCreate', 'SocketClose', 'Bind', 'Connect', 'CanRead', 'CanWrite', 'Listen', 'Accept', 'ReadCount', 'WriteCount', 'Wait', 'Error'); procedure TMyHTTP.Status(Sender: TObject; Reason: THookSocketReason; const Value: string); begin writeln(SocketReasonStrings[Ord(Reason)]+': '+Value); end; //untested Back to top theo Guest Posted: Mon Dec 05, 2005 8:07 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Quote: As stated in the first posting in this thread: that call always fails either by timing out (unless the server is shut down while waiting) or recently somewhat faster, but though it fails it reports success. All other means of communicating with the server (IE, Indy, telnet...) work! I have no idea because I don't see the code, but this could also be a simple protocol problem like the client or server waiting for some CRLF sequence before disconnect. Back to top Tim Robbins Guest Posted: Mon Dec 05, 2005 8:55 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients theo wrote: Quote: To put some light in it, you should try to get the Socket Status event at least in the client. OK. Did that. Unfortunately, from my newcomer's point of view, this doesn't offer any more information than what I'd found tracing through... but it offers the information in a much more digestible form <G>! The GET "successfully" writes to the socket but doesn't receive anything in turn. Here's what a successful GET shows (Synapse hitting INDY server demo): SocketClose: ResolvingBegin: 127.0.0.1:80 ResolvingEnd: 127.0.0.1:80 SocketCreate: IPv4 Connect: 127.0.0.1:80 WriteCount: 101 ReadCount: 202 SocketClose: SocketClose: Here's what a failed Synapse client to Synapse server reports: SocketClose: ResolvingBegin: 127.0.0.1:80 ResolvingEnd: 127.0.0.1:80 SocketCreate: IPv4 Connect: 127.0.0.1:80 WriteCount: 101 ***** LONG PAUSE HERE FOR TIMEOUT ***** Error: 10060,Connection timed out Error: 10060,Connection timed out CanRead: Error: 10054,Connection reset by peer SocketClose: SocketClose: Back to top Tim Robbins Guest Posted: Mon Dec 05, 2005 9:20 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Ben, Oops. I hit send before saying: Thank you! Back to top Tim Robbins Guest Posted: Mon Dec 05, 2005 9:25 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Theo, What are the odds that these fixes will be folded into the library's code? Are you and Ben contributors (committers)? Back to top Ben Hochstrasser Guest Posted: Mon Dec 05, 2005 10:01 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients theo wrote: Quote: I have no idea because I don't see the code, but this could also be a simple protocol problem like the client or server waiting for some CRLF sequence before disconnect. Ah, in httpsend.pas, lines 369ff, change if status100 then FHeaders.Insert(0, 'Expect: 100-continue'); FHeaders.Insert(0, 'Content-Length: ' + IntToStr(FDocument.Size)); if Sending then begin // FHeaders.Insert(0, 'Content-Length: ' + IntToStr(FDocument.Size)); if FMimeType <> '' then FHeaders.Insert(0, 'Content-Type: ' + FMimeType); end; to if status100 then FHeaders.Insert(0, 'Expect: 100-continue'); // FHeaders.Insert(0, 'Content-Length: ' + IntToStr(FDocument.Size)); if Sending then begin FHeaders.Insert(0, 'Content-Length: ' + IntToStr(FDocument.Size)); if FMimeType <> '' then FHeaders.Insert(0, 'Content-Type: ' + FMimeType); end; ie even with an empty document to send (eg upload) httpsend.pas sends a "Content-Length" header; the server in turn waits for n content-length bytes (or infinitely when it's set to zero (=unknown). -- Ben Back to top theo Guest Posted: Mon Dec 05, 2005 10:21 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Ben Hochstrasser schrieb: Quote: theo wrote: I have no idea because I don't see the code, but this could also be a simple protocol problem like the client or server waiting for some CRLF sequence before disconnect. Congratulations! ;-) I've found the problem myself now, although I've fixed it on the server side: procedure TTCPHttpThrd.Execute; ...... Headers.add(s); Size := -1; // ADD THIS LINE IF CONTENT-LENGTH NOT SENT! if Pos('CONTENT-LENGTH:', Uppercase(s)) = 1 then Size := StrToIntDef(SeparateRight(s, ' '), -1); Back to top Ben Hochstrasser Guest Posted: Mon Dec 05, 2005 10:38 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Tim Robbins wrote: Quote: What are the odds that these fixes will be folded into the library's code? I'll open a bug report via the mailing list. Quote: Are you and Ben contributors (committers)? No. I'm just a long-time (and happy) user. -- Ben Back to top theo Guest Posted: Mon Dec 05, 2005 10:39 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Tim Robbins schrieb: Quote: Theo, What are the odds that these fixes will be folded into the library's code? Are you and Ben contributors (committers)? No, I'm not. Rule #1: Never trust a Synapse-demo. They're sometimes outdated or just "get you going" without being complete or bug-free. The Synapse Library however has less bugs than Indy imho. Synapse's advantage is (for me): less blackboxes, less bloated, and once you know how it works, you feel like you'd understand something ;-) Disadvantages: (The other side of the medal) It's less automated. Example: There is no "follow redirects" in httpsend. You have to code that by hand. But for writing decent servers, it's better than Indy (always imho). Why not contribute? Humm, I think I forget the problem after fixing it.... ;-) Back to top Ben Hochstrasser Guest Posted: Mon Dec 05, 2005 10:42 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients theo wrote: Quote: I've found the problem myself now, although I've fixed it on the server side: I traced the dialog with Firefox, MSIE etc, and the browsers do /not/ send a "Content-Length:" header when there's nothing to send. A server, however, might want to wait for some arbitrary time when it encounters a Content- Length header entry, even if it's zero. (But most probably ignore it when the request is "GET") -- Ben Back to top theo Guest Posted: Mon Dec 05, 2005 10:54 pm    Post subject: Re: Synapse httpserv doesn't "talk" with Synapse clients Hi Ben Quote: A server, however, might want to wait for some arbitrary time when it encounters a Content- Length header entry, even if it's zero. What for? Can you elaborate? 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