From: "Nadav Har'El" <[EMAIL PROTECTED]> > On Tue, Apr 09, 2002, Eli Marmor wrote about "Re: OT: Transparent Proxies in Israel": > > But back to the original question: Can anybody list the ISP's that > > don't use transparent proxies, even not for ADSL users who access > > foreign (long distance) sites? > > No, I never did such research. When I was connected to Netvision's ADSL > it looked like we did not have a transparent proxy, but I'm not sure. > In Barak's connection, I did notice a transparent proxy in place. >
I think that even if the ISP run transparent proxy, or actually any kind of HTTP proxy, they should query the server in any case - to see if the content is modified. If it does, it redownloads the content, and if not, it serves from cache. In any case, it shouldn't serve old data without checking first. I'm connected to BezeqInt ADSL, and it looks like they do have a transparent proxy, and it works correctly. I did some testing: [sagi@domino sagi]$ telnet sagi.org 80 Trying 208.38.141.10... Connected to sagi.org. Escape character is '^]'. GET http://sagi.org/ctest.html HTTP/1.0 HTTP/1.0 200 OK Age: 0 Date: Tue, 09 Apr 2002 08:40:04 GMT Content-Length: 5 Content-Type: text/html Server: Apache/1.3.19 (Unix) PHP/4.0.6 FrontPage/5.0.2.2510 Last-Modified: Tue, 09 Apr 2002 08:46:39 GMT ETag: "16bdf8-5-3cb2aa6f" Via: 1.1 proxy-ptk-primary (NetCache NetApp/5.2.1R1D3) test Connection closed by foreign host. Apache log: 212.179.233.155 - - [09/Apr/2002:04:47:26 -0400] "GET /ctest.html HTTP/1.1" 200 5 "-" "-" Change file [sagi@domino sagi]$ telnet sagi.org 80 Trying 208.38.141.10... Connected to sagi.org. Escape character is '^]'. GET http://sagi.org/ctest.html HTTP/1.0 HTTP/1.0 200 OK Age: 0 Date: Tue, 09 Apr 2002 08:40:28 GMT Content-Length: 7 Content-Type: text/html Server: Apache/1.3.19 (Unix) PHP/4.0.6 FrontPage/5.0.2.2510 Last-Modified: Tue, 09 Apr 2002 08:47:39 GMT ETag: "16bdf8-7-3cb2aaab" Via: 1.1 proxy-ptk-primary (NetCache NetApp/5.2.1R1D3) test 2 Connection closed by foreign host. Apache log: 212.179.233.155 - - [09/Apr/2002:04:47:50 -0400] "GET /ctest.html HTTP/1.1" 200 7 "-" "-" Didn't change, trying to fetch the same file again: [sagi@domino sagi]$ telnet sagi.org 80 Trying 208.38.141.10... Connected to sagi.org. Escape character is '^]'. GET http://sagi.org/ctest.html HTTP/1.0 HTTP/1.0 200 OK Age: 0 Accept-Ranges: bytes Date: Tue, 09 Apr 2002 08:40:56 GMT Content-Length: 7 Content-Type: text/html Server: Apache/1.3.19 (Unix) PHP/4.0.6 FrontPage/5.0.2.2510 Last-Modified: Tue, 09 Apr 2002 08:47:39 GMT ETag: "16bdf8-7-3cb2aaab" Via: 1.1 proxy-ptk-primary (NetCache NetApp/5.2.1R1D3) test 2 Connection closed by foreign host. [sagi@domino sagi]$ Apache log: 212.179.233.155 - - [09/Apr/2002:04:48:18 -0400] "GET /ctest.html HTTP/1.1" 304 - "-" "-" As you can see, it contacted the server anyway, to see if the data was modified. Only after getting 304 header it served the content from cache.. Sagi ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
