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Before the page could even be requested, the network address of bclary.com had to Escorts be looked up and a TCP conection established. Note that on this satellite-based internet connection, the time required was on the order of one second. You can increase the page load performance of your content by minimizing the number of DNS look ups (the number of different machine names) required to load your content..

 12 2.354632 192.168.1.100 bclary.com HTTP GET / HTTP/1.1

 GET / HTTP/1.1\r\n
 Host: bclary.com\r\n
 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8a4) Gecko/20040924\r\n
 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\r\n
 Accept-Language: en-us,en;q=0.5\r\n
 Accept-Encoding: gzip,deflate\r\n
 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n
 Keep-Alive: 300\r\n
 Connection: keep-alive\r\n
 \r\n

Mozilla requested the URL . Note how Mozilla identifies itself, and begins negotiating with the web server by sending preferences for Content Types, Language, Encoding, Character Sets, and TCP connection. Note also that Mozilla did not have a copy of the document already in its cache when this request was made.

 13 2.358182 bclary.com 192.168.1.100 TCP  http > 1497 [ACK] Seq=1 Ack=385 Win=4096 Len=0
 16 4.010677 bclary.com 192.168.1.100 HTTP HTTP/1.1 200 OK (application/xhtml+xml)

 HTTP/1.1 200 OK\r\n
 Date: Sun, 26 Sep 2004 03:44:17 GMT\r\n
 Server: Apache/1.3.31 (Unix) DAV/1.0.3 mod_gzip/1.3.26.1a PHP/4.3.5 mod_ssl/2.8.19 OpenSSL/0.9.6c\r\n
 Last-Modified: Tue, 21 Sep 2004 06:41:26 GMT\r\n
 ETag: "4f2e5d-29dc-414fcd16"\r\n
 Accept-Ranges: bytes\r\n
 Keep-Alive: timeout=15, max=100\r\n
 Connection: Keep-Alive\r\n
 Content-Type: application/xhtml+xml\r\n
 Content-Encoding: gzip\r\n
 Content-Length: 3456\r\n
 \r\n

 17 4.011942 bclary.com 192.168.1.100 HTTP Continuation
 18 4.011966 192.168.1.100 bclary.com TCP  1497 > http [ACK] Seq=385 Ack=2841 Win=17040 Len=0
 19 4.036299 192.168.1.100 bclary.com TCP  1498 > http [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1460
 20 4.039000 bclary.com 192.168.1.100 TCP  http > 1498 [SYN, ACK] Seq=0 Ack=1 Win=4096 Len=0 MSS=1420
 21 4.039023 192.168.1.100 bclary.com TCP  1498 > http [ACK] Seq=1 Ack=1 Win=17040 Len=0

bclary.com responded with the HTTP headers and the contents of the document. Note how the web server gave the current date, the last time the document was modified, established a TCP connection which will be kept alive, and responded with a Content Type for XHTML and a gzipped compressed encoded version of the page. Note that since the retrieved document is compressed, Mozilla must wait for it to be fully downloaded before parsing the contents and issuing any additional requests for content which is referenced by the document.

 22 4.039634 192.168.1.100 bclary.com HTTP GET /2004/07/21/style HTTP/1.1

 GET /2004/07/21/style HTTP/1.1\r\n
 Host: bclary.com\r\n
 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8a4) Gecko/20040924\r\n
 Accept: text/css,*/*;q=0.1\r\n
 Accept-Language: en-us,en;q=0.5\r\n
 Accept-Encoding: gzip,deflate\r\n
 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n
 Keep-Alive: 300\r\n
 Connection: keep-alive\r\n
 Referer: \r\n
 \r\n

 23 4.042358 bclary.com 192.168.1.100 TCP  http > 1498 [ACK] Seq=1 Ack=349 Win=4096 Len=0
 24 4.077165 bclary.com 192.168.1.100 HTTP Continuation
 25 4.213129 192.168.1.100 bclary.com TCP  1497 > http [ACK] Seq=385 Ack=3850 Win=16031 Len=0
 28 6.213411 bclary.com 192.168.1.100 HTTP HTTP/1.1 200 OK (text/css)

 HTTP/1.1 200 OK\r\n
 Date: Sun, 26 Sep 2004 03:44:20 GMT\r\n
 Server: Apache/1.3.31 (Unix) DAV/1.0.3 mod_gzip/1.3.26.1a PHP/4.3.5 mod_ssl/2.8.19 OpenSSL/0.9.6c\r\n
 Content-Location: style.css\r\n
 Vary: negotiate\r\n
 TCN: choice\r\n
 Last-Modified: Wed, 21 Jul 2004 14:01:17 GMT\r\n
 ETag: "be598-3d7-40fe772d;41427405"\r\n
 Accept-Ranges: bytes\r\n
 Content-Length: 983\r\n
 Keep-Alive: timeout=15, max=100\r\n
 Connection: Keep-Alive\r\n
 Content-Type: text/css\r\n
 \r\n

Once the original document was downloaded and parsed, Mozilla was able to request the CSS style sheet which was referenced in the XHTML of the page. Mozilla had to wait for the full document to download before making the request because the document was compressed by the web server. This saved the bandwidth required to download the file, but forced Mozilla to wait to request the style sheet rather than parsing the document as it downloaded and immediately requesting the style sheet when it was referenced. Note that it took Mozilla almost 5 seconds to download the page and the referenced CSS file.