-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Shubham,
On 6/29/2011 1:50 PM, Shubham Gupta wrote: > In order to implement infinite caching, we have put an 'Expires' & a > 'Max-Age' header to a large value, but still the browser makes a > conditional GET for files having a relatively new 'Last-Modified' time. > Is this a normal behaviour ? I guess clients are allowed to to whatever they want. Is there anything else going on? Intermediate proxy? SSL? Other headers at play? > If we remove the 'Last-Modified' & the 'Etag' header, then it always > fetches the file from cache. What is "it"? The browser? The server? Which cache? > Since there is no 'Last-Modified' header, > it doesn't have an 'If-Modified-Since' header when making a conditional > GET (on pressing F5). What makes it a conditional GET if there is no If-Modified-Since header? > Therefore, the whole file is sent back (Response: 200 OK). Sounds like an unconditional GET to me. > Since we noticed that for files having relatively old timestamps > conditional GETs are being sent less frequently, we are planning to set > the 'Last-Modified' header to a really old value (say 1970). Why would you do that? If the browser is ignoring your recent Last-Modified header, why do you think it would honor one set far into the past? I wouldn't be surprised if browsers are "smart" enough to detect that dates like (UNIX) zero are an error and therefore ignore them, returning you to your unconditional GET scenario. > Does doing this have any disadvantage Writing hacks to lie to the client? Yes, the disadvantages are that you have to write a lot of code (or configuration) to force something that should be working in the first place. I suspect there is another problem that needs to be addressed and that you are looking in the wrong place. > is it an efficient way to implement infinite caching or we are > missing out something here ? Are you allowing the server to calculate an Etag header? Is the browser sending the Etag back to the server? - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk4LcawACgkQ9CaO5/Lv0PBx+ACgnDokV7pVwnOphXiLcHDz7tKi mQcAoIAiL68GCJ0VfZ/XwfX//CuL2/uq =aX8J -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
