BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  To Remy Lebeau - Re IdHTTP + proxy          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Alan Garny Guest Posted: Tue Jan 13, 2004 3:09 pm    Post subject: To Remy Lebeau - Re IdHTTP + proxy Thanks for your help and that of others. I have finally managed to get IdHTTP to work with a proxy server using a BASIC authentication method. "All" I had to do was to add a couple of lines, namely those that clear "Request" and "ProxyParams". The rest of my code remains the same (see below). To clear "ProxyParams" is critical, since amongst other things it clears "ProxyServer" and "ProxyPort", which in turn clear "Authentication". So, all I have in the end is an instance of TIdHTTP that I have filled up with the relevant proxy information. I don't use any other Indy component. From there, I can make calls like "IdHTTP.Get(URI, StreamFile);". I have tried that code in the following situations: - No proxy server: I can access the document ---> OK - Proxy server without authentication required: I can access the document ---> OK - Proxy server with authentication required, BUT none provided: I canNOT access the document ---> OK - Proxy server with authentication required AND with some provided: I can access the document ---> OK Now, as I said, this only works with a basic authentication mechanism. Ideally, I would have a solution that works with all types of authentication... For this, I would need a proxy server that can handle digest and/or NTLM (are there others?), which I don't. I tried to look for a good proxy server (and easy to configure), but couldn't find one. Any idea? Cheers, Alan. ------------------- // Clear the request and proxy parameters IdHTTP.Request.Clear; IdHTTP.ProxyParams.Clear; // Setup the proxy parameters, if necessary If (InternetOptions.UseProxyServer) Then With IdHTTP.ProxyParams Do Begin // Proxy server IP address (e.g. "127.0.0.1") ProxyServer := InternetOptions.Server; // Proxy port (e.g. "8080") ProxyPort := InternetOptions.Port; // Basic authentication or not? (i.e. "True" or "False") BasicAuthentication := InternetOptions.ProxyAuthentication; If (InternetOptions.ProxyAuthentication) Then Begin // Proxy username (e.g. "myname") ProxyUsername := InternetOptions.Username; // Have to ask the user for the password? If (InternetOptions.AskForPassword) Then // Ask the user for the password With TPasswordForm.Create(Self, 'Proxy password') Do Begin ShowModal; // Proxy password (e.g. "mypassword") ProxyPassword := PasswordVal.Text; Free; End Else // Retrieve the password from the internet options ProxyPassword := Decrypt(InternetOptions.Password); End; End; ------------------- Back to top Darek Wasacz Guest Posted: Tue Feb 03, 2004 12:34 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy I have the problem with getting proxy settings from IE. I've been following your 'fight' with proxy. I very appreciate your effort to solve the problem :-) Could I ask you where does the InternetOptions class come from ? Is this your component or a third-party one ? Thank you in advance, Darek Wasacz Back to top Alan Garny Guest Posted: Tue Feb 03, 2004 1:08 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Darek Wasacz" <wasacz (AT) instalsoft (DOT) com.pl> wrote Quote: I have the problem with getting proxy settings from IE. I've been following your 'fight' with proxy. I very appreciate your effort to solve the problem :-) Could I ask you where does the InternetOptions class come from ? Is this your component or a third-party one ? It is a class of mine. That's where I internally store all the internet options for my application. Otherwise, my code that now works (seems to work at least) fine with both Basic and NTLM authentication (as well as without any authentication at all) is as follows: // Set up the Internet connection IdHTTP.Request.Clear; IdHTTP.ProxyParams.Clear; IdHTTP.Response.Clear; If (InternetOptions.ConnectThroughProxyServer) Then With IdHTTP.ProxyParams Do Begin ProxyServer := InternetOptions.ProxyServer; ProxyPort := InternetOptions.ProxyPort; BasicAuthentication := InternetOptions.ProxyAuthenticationMethod = 'Basic'; If (BasicAuthentication) Then Begin ProxyUsername := InternetOptions.ProxyAuthenticationUsername; If (InternetOptions.ProxyAuthenticationAskForPassword) Then With TPasswordForm.Create(Self, 'Proxy server password') Do Begin ShowModal; If (ModalResult = mrOk) Then ProxyPassword := PasswordVal.Text; Free; End Else ProxyPassword := Decrypt(InternetOptions.ProxyAuthenticationPassword); End; End; // Check for an update InfoFile := TFileStream.Create(InfoCORFileName, fmCreate); ProxyErrorMsg := ''; Try // Get the XML file that contains the versions information for COR IdHTTP.Get(CORUpdateInfo, InfoFile); IdHTTP.Disconnect; InfoFile.Free; Except // Cannot get the version info for COR from the COR web site Case IdHTTP.ResponseCode Of 200: ProxyErrorMsg := 'Your proxy server cannot handle '+InternetOptions.ProxyAuthenticationMethod+' authentication.'; 407: ProxyErrorMsg := 'Your proxy server requires explicit authentication.'; End; If (Not aStartup) Then ErrorMessageDlg; InfoFile.Free; DeleteFile(InfoCORFileName); End; ... Back to top Bryan Guest Posted: Tue Feb 03, 2004 2:09 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy I've tried using you code below with a few changes (internetoptions. stuff removed and hard coded settings). Anyway, I get an error code 503 service unavailable. After looking this up, it seems that the server is busy, but I can get the file I'm after with Internet Explorer very quickly, so I'm not sure that the server is... busy. My Proxy uses Basic authentication, and port 8080. I supply the userID and Password, and the IP address of the proxy server. Any thoughts? Thanks Bryan "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: "Darek Wasacz" <wasacz (AT) instalsoft (DOT) com.pl> wrote in message news:401f9559$1 (AT) newsgroups (DOT) borland.com... I have the problem with getting proxy settings from IE. I've been following your 'fight' with proxy. I very appreciate your effort to solve the problem :-) Could I ask you where does the InternetOptions class come from ? Is this your component or a third-party one ? It is a class of mine. That's where I internally store all the internet options for my application. Otherwise, my code that now works (seems to work at least) fine with both Basic and NTLM authentication (as well as without any authentication at all) is as follows: // Set up the Internet connection IdHTTP.Request.Clear; IdHTTP.ProxyParams.Clear; IdHTTP.Response.Clear; If (InternetOptions.ConnectThroughProxyServer) Then With IdHTTP.ProxyParams Do Begin ProxyServer := InternetOptions.ProxyServer; ProxyPort := InternetOptions.ProxyPort; BasicAuthentication := InternetOptions.ProxyAuthenticationMethod = 'Basic'; If (BasicAuthentication) Then Begin ProxyUsername := InternetOptions.ProxyAuthenticationUsername; If (InternetOptions.ProxyAuthenticationAskForPassword) Then With TPasswordForm.Create(Self, 'Proxy server password') Do Begin ShowModal; If (ModalResult = mrOk) Then ProxyPassword := PasswordVal.Text; Free; End Else ProxyPassword := Decrypt(InternetOptions.ProxyAuthenticationPassword); End; End; // Check for an update InfoFile := TFileStream.Create(InfoCORFileName, fmCreate); ProxyErrorMsg := ''; Try // Get the XML file that contains the versions information for COR IdHTTP.Get(CORUpdateInfo, InfoFile); IdHTTP.Disconnect; InfoFile.Free; Except // Cannot get the version info for COR from the COR web site Case IdHTTP.ResponseCode Of 200: ProxyErrorMsg := 'Your proxy server cannot handle '+InternetOptions.ProxyAuthenticationMethod+' authentication.'; 407: ProxyErrorMsg := 'Your proxy server requires explicit authentication.'; End; If (Not aStartup) Then ErrorMessageDlg; InfoFile.Free; DeleteFile(InfoCORFileName); End; ... Back to top Alan Garny Guest Posted: Tue Feb 03, 2004 3:12 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Bryan" <here (AT) somewhere (DOT) com> wrote Quote: I've tried using you code below with a few changes (internetoptions. stuff removed and hard coded settings). Anyway, I get an error code 503 service unavailable. After looking this up, it seems that the server is busy, but I can get the file I'm after with Internet Explorer very quickly, so I'm not sure that the server is... busy. My Proxy uses Basic authentication, and port 8080. I supply the userID and Password, and the IP address of the proxy server. Hmm... I am not quite sure to be honest... All I know is that I have tried NTLM and it worked and that I have a user of mine who is behind a proxy that requires basic authentication and that it works for him too. There are people on this newsgroup that seem to be pretty knowledgeable in terms of proxy servers, etc. Hopefully, they will be able to help you... Alan. Back to top Bryan Guest Posted: Tue Feb 03, 2004 6:45 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy Thanks Alan, I'll keep looking around. Maybe someone has seen this before. Bryan "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: "Bryan" <here (AT) somewhere (DOT) com> wrote in message news:401fabac$1 (AT) newsgroups (DOT) borland.com... I've tried using you code below with a few changes (internetoptions. stuff removed and hard coded settings). Anyway, I get an error code 503 service unavailable. After looking this up, it seems that the server is busy, but I can get the file I'm after with Internet Explorer very quickly, so I'm not sure that the server is... busy. My Proxy uses Basic authentication, and port 8080. I supply the userID and Password, and the IP address of the proxy server. Hmm... I am not quite sure to be honest... All I know is that I have tried NTLM and it worked and that I have a user of mine who is behind a proxy that requires basic authentication and that it works for him too. There are people on this newsgroup that seem to be pretty knowledgeable in terms of proxy servers, etc. Hopefully, they will be able to help you... Alan. Back to top Darek Wasacz Guest Posted: Thu Feb 05, 2004 12:28 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: It is a class of mine. That's where I internally store all the internet options for my application. Does your class read proxy settings from registry (as they are saved by Internet options dialogs in IE) ? If yes, how do you do it ? Thanks, Darek Back to top Alan Garny Guest Posted: Thu Feb 05, 2004 12:55 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Darek Wasacz" <wasacz (AT) instalsoft (DOT) com.pl> wrote Quote: "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: It is a class of mine. That's where I internally store all the internet options for my application. Does your class read proxy settings from registry (as they are saved by Internet > options dialogs in IE) ? If yes, how do you do it ? No, it doesn't, because I am not quite sure how it would work if someone was to use a different browser. So, I ask the user to provide them: http://cor.physiol.ox.ac.uk/Screenshots/Pics/CORInternetOptions.png Alan. Back to top Bryan Guest Posted: Thu Feb 05, 2004 1:19 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy Alan, Is your software shareware. I'm looking for some software to try within my network that uses Indy with a Proxy server just to see if it works on my netork. I've tried numerous snipletts of code posted in this news group and still cannot successfully download a file. If it works, then I know it is possible, I just have to figure it out. I'm going crazy! My Lan Admin says the proxy uses basic authentication. I keep getting a 503 error, but when I download with IE, no problems. Bryan "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: "Darek Wasacz" <wasacz (AT) instalsoft (DOT) com.pl> wrote in message news:4022370b$1 (AT) newsgroups (DOT) borland.com... "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: It is a class of mine. That's where I internally store all the internet options for my application. Does your class read proxy settings from registry (as they are saved by Internet > options dialogs in IE) ? If yes, how do you do it ? No, it doesn't, because I am not quite sure how it would work if someone was to use a different browser. So, I ask the user to provide them: http://cor.physiol.ox.ac.uk/Screenshots/Pics/CORInternetOptions.png Alan. Back to top Alan Garny Guest Posted: Thu Feb 05, 2004 2:58 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Bryan" <me (AT) somewhere (DOT) com> wrote Quote: Is your software shareware. I'm looking for some software to try within my network that uses Indy with a Proxy server just to see if it works on my netork. I've tried numerous snipletts of code posted in this news group and still cannot successfully download a file. If it works, then I know it is possible, I just have to figure it out. I'm going crazy! It's going to be open source, but it's not yet at the stage whereI want to release it as such. I will try to find the time to create a small app that allows you to download any file on a http server whether you are behind a proxy server or not, with the proxy server either requiring authentication (basic or NTLM) or not. Maybe this weekend... Alan. Back to top Bryan Guest Posted: Thu Feb 05, 2004 3:20 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy Alan, That would be above and beyond anything I would expect. THANK YOU!. Bryan "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: "Bryan" <me (AT) somewhere (DOT) com> wrote in message news:402242d4 (AT) newsgroups (DOT) borland.com... Is your software shareware. I'm looking for some software to try within my network that uses Indy with a Proxy server just to see if it works on my netork. I've tried numerous snipletts of code posted in this news group and still cannot successfully download a file. If it works, then I know it is possible, I just have to figure it out. I'm going crazy! It's going to be open source, but it's not yet at the stage whereI want to release it as such. I will try to find the time to create a small app that allows you to download any file on a http server whether you are behind a proxy server or not, with the proxy server either requiring authentication (basic or NTLM) or not. Maybe this weekend... Alan. Back to top Alan Garny Guest Posted: Sun Feb 08, 2004 8:19 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Bryan" <me (AT) somewhere (DOT) com> wrote Quote: That would be above and beyond anything I would expect. THANK YOU!. Ok, I have put a very small example of that in b.p.attachments. I have tried it with a proxy server that requires basic authentication and, as far as I can tell, it works fine. Something very weird, though, is that if I don't specify a proxy server, then it doesn't seem to be working (!!!). If, within the Delphi IDE, I trace the program, then it works! I am sorry, but I really don't have the time to figure out what is going on here. I know that it works fine in my normal application (I use that feature, i.e. download without a proxy server, at least once a week and I have never had any problem with it). Anyway, hope that helps... Alan. Back to top Bryan Guest Posted: Sun Feb 08, 2004 9:40 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy Alan, Thanks for your help! I'll give it a try. Bryan "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: "Bryan" <me (AT) somewhere (DOT) com> wrote in message news:40225f3f$1 (AT) newsgroups (DOT) borland.com... That would be above and beyond anything I would expect. THANK YOU!. Ok, I have put a very small example of that in b.p.attachments. I have tried it with a proxy server that requires basic authentication and, as far as I can tell, it works fine. Something very weird, though, is that if I don't specify a proxy server, then it doesn't seem to be working (!!!). If, within the Delphi IDE, I trace the program, then it works! I am sorry, but I really don't have the time to figure out what is going on here. I know that it works fine in my normal application (I use that feature, i.e. download without a proxy server, at least once a week and I have never had any problem with it). Anyway, hope that helps... Alan. Back to top Bryan Guest Posted: Mon Feb 09, 2004 8:25 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy Alan, I gave your test program a try and I still get a 403 Forbidden Error. I tried several different settings with no luck. I guess I'll have to get with the Lan shop again to find out what they are doing. Maybe they can trace the packets to and through the proxy. Thank you very much for your help. I'll post the solution if an when I get one. Bryan "Alan Garny" <someone (AT) somewhere (DOT) com> wrote: Quote: "Bryan" <me (AT) somewhere (DOT) com> wrote in message news:40225f3f$1 (AT) newsgroups (DOT) borland.com... That would be above and beyond anything I would expect. THANK YOU!. Ok, I have put a very small example of that in b.p.attachments. I have tried it with a proxy server that requires basic authentication and, as far as I can tell, it works fine. Something very weird, though, is that if I don't specify a proxy server, then it doesn't seem to be working (!!!). If, within the Delphi IDE, I trace the program, then it works! I am sorry, but I really don't have the time to figure out what is going on here. I know that it works fine in my normal application (I use that feature, i.e. download without a proxy server, at least once a week and I have never had any problem with it). Anyway, hope that helps... Alan. Back to top Alan Garny Guest Posted: Mon Feb 09, 2004 9:48 pm    Post subject: Re: To Remy Lebeau - Re IdHTTP + proxy "Bryan" <me (AT) somewhere (DOT) com> wrote Quote: I gave your test program a try and I still get a 403 Forbidden Error. I tried several different settings with no luck. I guess I'll have to get with the Lan shop again to find out what they are doing. Maybe they can trace the packets to and through the proxy. Hmm... very strange... As I told you, I tried with a proxy server that requires Basic authentication and, surely, if I either mistype my login and/or password, then I can download anymore, while it works fine as soon as both my login and password are correct. The same was observed by users of mine who are behind a proxy server that requires that type of authentication... Quote: Thank you very much for your help. I'll post the solution if an when I get one. That would be much appreciated and sorry I couldn't be of much more help... Alan. 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