iOS - Is it possible to cache the chunked HTTP response?

Question

I'm getting data from backend using AFNetworking and set request's cachePolicy as NSURLRequestUseProtocolCachePolicy.
The response headers contain ETag value and Transfer-Encoding is chunked.
Chunked Response

In the second time I call the same API, it gets the fresh data instead of getting from cache as expected.

I notice that if the response is not chunked (contain Content-Length header), caching work perfectly
not chunked response

My question is: is it possible to cache chunked response in iOS?
Thank you for any advice

I think you might find my answer useful: stackoverflow.com/questions/20248707/… — m_katsifarakis
– m_katsifarakis, Commented Aug 31, 2015 at 17:10

Aaron Brager · Accepted Answer · 2015-04-07 04:27:37Z

0

NSURLCache, which AFNetworking uses for caching, doesn't support caching this type of request.

You could try:

using SDURLCache, an open-source alternative that gives you more control, or
subclassing NSURLCache yourself to roll your own implementation
using requests that have supported caching headers

answered Apr 7, 2015 at 4:27

Aaron Brager

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2 Comments

Hai Hw Over a year ago

Do you have any official document saying NSURLCache doesn't support?

quellish Over a year ago

from the NSURLRequest documentation: "If you are making HTTP or HTTPS byte-range requests, always use the NSURLRequestReloadIgnoringLocalCacheData policy. To learn more, read Caching Byte-Range Requests."

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