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NSURLRequest caching and conditional GET

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NSURLRequest caching and conditional GET

Subject: NSURLRequest caching and conditional GET
From: Henrik Nyh <email@hidden>
Date: Sat, 06 Jan 2007 18:51:57 +0100

Hullo,

I am implementing a HTTP conditional GET using NSURLRequest/NSMutableURLRequest.

I found that with default caching, I would constantly get a 200 response (rather than 304) even when sending If-Modified-Since and If-None-Match headers that correspond to the Last-Modified and ETag values. The server logs suggest the request didn't go remote.

Turning off caching gives the correct 304 response.

The mailing list post http://lists.apple.com/archives/Cocoa-dev/2004/Sep/msg00868.html suggests the default caching might use If-Modified-Since. Is that true?

I guess my actual question is: if I want to make conditional GETs, could I just rely on default caching and not include If-Modified-Since/If-None-Match headers? Does that pretty much amount to a conditional GET? Or should I disable caching?

--
Henrik Nyh
http://henrik.nyh.se
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