Martin - I can verify that my ETag implementation meets the spec requirements. Both buffered and streaming impls. yield the same ETag. With the buffered implementation tomcat does include the ETag header in the response. With the streaming impl. it does not (even though I set Trailer: ETag)
--Keyur mgainty wrote: > > > coding needs to conform to the spec's requirement for [weak]opaque-tag > > entity-tag = [ weak ] opaque-tag > weak = "W/" > opaque-tag = quoted-string > > > A "strong entity tag" MAY be shared by two entities of a resource > only if they are equivalent by octet equality.(i interpret this as byte > for byte equivalence) > > > > A "weak entity tag," indicated by the "W/" prefix, MAY be shared by > two entities of a resource only if the entities are equivalent and > could be substituted for each other with no significant change in > semantics. A weak entity tag can only be used for weak comparison. > > E-Tags are generally used for transmission of sizable resources such as > blobs/jpgs > > http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11 > > Martin Gainty > ______________________________________________ > Verzicht und Vertraulichkeitanmerkung/Note de déni et de confidentialité > > Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene > Empfaenger sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte > Weiterleitung oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht > dient lediglich dem Austausch von Informationen und entfaltet keine > rechtliche Bindungswirkung. Aufgrund der leichten Manipulierbarkeit von > E-Mails koennen wir keine Haftung fuer den Inhalt uebernehmen. > Ce message est confidentiel et peut être privilégié. Si vous n'êtes pas le > destinataire prévu, nous te demandons avec bonté que pour satisfaire > informez l'expéditeur. N'importe quelle diffusion non autorisée ou la > copie de ceci est interdite. Ce message sert à l'information seulement et > n'aura pas n'importe quel effet légalement obligatoire. Étant donné que > les email peuvent facilement être sujets à la manipulation, nous ne > pouvons accepter aucune responsabilité pour le contenu fourni. > > > > >> Date: Wed, 5 Aug 2009 14:55:35 -0700 >> From: keyu...@gmail.com >> To: users@tomcat.apache.org >> Subject: Re: Trailer header and tomcat >> >> >> Thanks Filip. Buffering is what I do right now and that is what I'm >> trying to >> avoid. With a large number of concurrent users, the buffering is proving >> to >> be a performance bottleneck and is causing frequent GC sweeps. >> >> I think what I'm trying to do with the Trailer header is valid http usage >> (correct me if that's wrong). And I was hoping tomcat supports this >> usage. >> >> --Keyur >> >> >> Filip Hanik - Dev Lists wrote: >> > >> > On 08/05/2009 02:14 PM, Keyur Shah wrote: >> >> Tomcat by default sends chunked responses => >> Transfer-Encoding:chunked >> >> >> >> I'm calculating the ETag for the response dynamically as the content >> is >> >> being >> >> written to the response stream. Since I'll know the final value of the >> >> ETag >> >> only >> >> when the stream is closed, I indicate that using the Trailer header => >> >> Trailer: >> >> ETag >> >> >> >> I'm ensuring that just before the stream is closed, I set the ETag >> header >> >> => >> >> ETag: SomeETagValue >> >> >> >> However, when I look at the response on the client, the ETag header >> was >> >> never >> >> written. >> >> >> >> Is this a tomcat specific bug or am I doing something wrong? >> >> >> > When you write, after you have filled up the buffer, tomcat will commit >> > the response. >> > You will need to not write any of your response until you have the tag, >> > so buffer your response, >> > calculate your tag, set the header, write the response >> > >> > Filip >> >> Thanks, >> >> Keyur >> >> >> > >> > >> > --------------------------------------------------------------------- >> > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> > For additional commands, e-mail: users-h...@tomcat.apache.org >> > >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/Trailer-header-and-tomcat-tp24835409p24836927.html >> Sent from the Tomcat - User mailing list archive at Nabble.com. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> > > _________________________________________________________________ > Express your personality in color! Preview and select themes for Hotmail®. > http://www.windowslive-hotmail.com/LearnMore/personalize.aspx?ocid=PID23391::T:WLMTAGL:ON:WL:en-US:WM_HYGN_express:082009 > -- View this message in context: http://www.nabble.com/Trailer-header-and-tomcat-tp24835409p24837402.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
