BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  HTTP client-server          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Paul Guest Posted: Sun Nov 21, 2004 11:32 am    Post subject: HTTP client-server Hi, I am trying to send commands to a HTTPserver that have to be executed on the server immedialety without sending a reply back to the client. If I keep the connection alive , I can do this without specifying aUrl, ie Client.Get(aCommand); This way , I have to send back a reply from the server to the client, but the communication beteen the client and the server takes approx 1 second. How can I prevent this communication ? On the client I can send TCP commands like SendCmd( ). , which I cannot find on the server. How can I use these 'TCP'-commands and if so, are they HTTP incapsutalions? Paul Back to top Remy Lebeau (TeamB) Guest Posted: Mon Nov 22, 2004 7:37 pm    Post subject: Re: HTTP client-server "Paul" <paul.blommaerts (AT) telenet (DOT) be> wrote Quote: I am trying to send commands to a HTTPserver that have to be executed on the server immedialety without sending a reply back to the client. That is not how HTTP works. HTTP is a command-response architecture. What EXACTLY are you trying to accomplish, and why are you using HTTP for it? Quote: This way , I have to send back a reply from the server to the client, but the communication beteen the client and the server takes approx 1 second. So? Quote: How can I prevent this communication ? You don't. Not with HTTP. Quote: On the client I can send TCP commands like SendCmd( ) SendCmd() waits for a reply as well. Gambit Back to top Paul Guest Posted: Mon Nov 22, 2004 7:54 pm    Post subject: Re: HTTP client-server Hi Remy, I am trying to send commands to a remote PC (server) to control a machine. Since it is behind a firewall, I must use HTTP. I have tried TCP before, which works fine on my personal LAN . I am now trying to do the same over HTTP. I can get it to work with a 'Keep-alive' connection. The commands are received on the server and the result is send back to the client. This works fine, except that after the command/result is send, I can see there is still a communication for approx 1 sec. afterwards. In this 1 second period, I can't start the next command within the same thread. I'm not sure yet , but I think maybe this is the 'Keep-alive' communication between the client and the server afterwards. It is very important to me to send a few commands/sec at times. Is there a work around for this? Paul Back to top Remy Lebeau (TeamB) Guest Posted: Mon Nov 22, 2004 9:37 pm    Post subject: Re: HTTP client-server "Paul" <paul.blommaerts (AT) telenet (DOT) be> wrote Quote: I am trying to send commands to a remote PC (server) to control a machine. Since it is behind a firewall, I must use HTTP. Having a firewall does not mean that you are limited to HTTP. It just means that the firewall only allows communications over port 80. There is a difference between the two. Quote: I can get it to work with a 'Keep-alive' connection. The commands are received on the server and the result is send back to the client. This works fine, except that after the command/result is send, I can see there is still a communication for approx 1 sec. afterwards. See how exactly? What exactly are you looking at? On which side of the connection? Quote: In this 1 second period, I can't start the next command within the same thread. Please show your actual code. Sounds like your code itself is delayed. Quote: I'm not sure yet , but I think maybe this is the 'Keep-alive' communication between the client and the server afterwards. There is no such communication. "Keep-alive" simply means that neither end closes the socket after the response is transmitted. Nothing more. There are no communications between a response and the next request. Quote: It is very important to me to send a few commands/sec at times. Then HTTP is probably not the right choice for you in the first place. Gambit Back to top Paul Guest Posted: Mon Nov 22, 2004 10:19 pm    Post subject: Re: HTTP client-server Quote: Having a firewall does not mean that you are limited to HTTP. It just means that the firewall only allows communications over port 80. There is a difference between the two. Not entirely true, I know a few firms that filter out TCP on port 80 (one of them is a bank) I have tested the communication again without the 'Keep-alive' option set on the client and on the server as I did before. It now works without the delay. Paul Back to top Robby Tanner Guest Posted: Mon Nov 22, 2004 11:21 pm    Post subject: Re: HTTP client-server "Paul" <paul.blommaerts (AT) telenet (DOT) be> wrote Quote: Having a firewall does not mean that you are limited to HTTP. It just means that the firewall only allows communications over port 80. There is a difference between the two. Not entirely true, I know a few firms that filter out TCP on port 80 (one of them is a bank) He was referring to the firewall you were talking about. Quote: I have tested the communication again without the 'Keep-alive' option set on the client and on the server as I did before. It now works without the delay. That's intriguing. You made no other changes? Rob Back to top Paul Guest Posted: Tue Nov 23, 2004 8:38 pm    Post subject: Re: HTTP client-server Hi Rob, Quote: I have tested the communication again without the 'Keep-alive' option set on the client and on the server as I did before. It now works without the delay. That's intriguing. You made no other changes? Rob No, I only removed the Keep-alive connection on the client side. The connection settings on the servers is stll 'Keep-alive'. I am now testing with a small program. The only thing it does is send a dummy command to the server and wait for an answer. The strange thing here is that when I press and cmdGet-button once, I get a single respond from the server. When I press and hold the button and stop after about 200 requests, there is still a communication for a few seconds afterwards. Is there a buffer that has to be cleared after each request? Client : Form1.Connect; begin HTTP1.Host:= '192.168.1.108'; HTTP1.Connect; end; procedure Form1.cmdGetClick(Sender: TObject); //button onclick var S: string; begin S:= HTTP1.Get('192.168.1.108'); label1.Caption:= S; end; Server : procedure TServerForm.IdHTTPServer1CommandGet(AThread: TIdPeerThread; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo); var S,cmd:string; begin S:= ARequestInfo.Document; inc (A); AResponseInfo.ContentText:= 'Ready' + intToStr(A); end; Paul Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Internet Winsock All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.