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ARR Disk cache return 200 instead of 304 for cached files
Jun 13, 2014 08:33 AM|dufkaf|LINK
I have a server farm and ARR in front of it. If ARR disk cache is not enabled everything works as expected. Request/responses contain cache control headers, etags and when I click refresh in browser the servers in farm return 304 not modified.
When I enable Disk cache I see the files cached correctly on disk, but when ARR returns data from such disk cache it always answers with HTTP 200 OK instead of 304 not modified so the browsers downloads the same data again!
Here is request response headers when I enable disk cahe and response is served by ARR disk cache
request:
response:
Please note same ETag, same Last-Modified yet it returns HTTP 200
And here is same one when ARR disk cache is disabled and the request hits the backend server which correctly responds with 304
I tried to modify IIS static file caching settings on ARR machine, disabled compression but with no difference.
To me it looks like this should be not related to IIS caching but looks like bug/feature of the the disk cache module as it is the logic of disk cache code to determine the file is in the cache and the etag/date is correct (?)
Anyone has this working correctly? Any tips how to troubleshoot this?
3×× Redirection
A conditional GET or HEAD request has been received and would have resulted in a 200 OK response if it were not for the fact that the condition evaluated to false.
In other words, there is no need for the server to transfer a representation of the target resource because the request indicates that the client, which made the request conditional, already has a valid representation; the server is therefore redirecting the client to make use of that stored representation as if it were the payload of a 200 OK response.
The server generating a 304 response MUST generate any of the following header fields that would have been sent in a 200 OK response to the same request: Cache-Control, Content-Location, Date, ETag, Expires, and Vary.
Since the goal of a 304 response is to minimize information transfer when the recipient already has one or more cached representations, a sender SHOULD NOT generate representation metadata other than the above listed fields unless said metadata exists for the purpose of guiding cache updates (e.g., Last-Modified might be useful if the response does not have an ETag field).
Requirements on a cache that receives a 304 response are defined in Section 4.3.4 of RFC7234. If the conditional request originated with an outbound client, such as a user agent with its own cache sending a conditional GET to a shared proxy, then the proxy SHOULD forward the 304 response to that client.
A 304 response cannot contain a message-body; it is always terminated by the first empty line after the header fields.
Rails HTTP Status Symbol
:not_modified
Go HTTP Status Constant
http.StatusNotModified
Symfony HTTP Status Constant
Response::HTTP_NOT_MODIFIED
Python2 HTTP Status Constant
httplib.NOT_MODIFIED
Python3+ HTTP Status Constant
http.client.NOT_MODIFIED
Python3.5+ HTTP Status Constant ← Return to httpstatuses.comhttp.HTTPStatus.NOT_MODIFIED
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