Why are responses with `Content-Length = 0` not stored in URLCache?

Question

Created May ’21

Replies 2

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Participants 2

Hi!

I noticed that responses with Content-Length = 0 are not stored in the URLCache, while responses with Content-Length > 0 are stored.

In my case the response contains a Protobuf message where all fields might have default values. This message will have size 0 when encoded and is a valid message. I would expect this message to be cached as all other instances of the message type.

Is there a reason why 0-sized response are not stored in cache? Or is it a bug?

Best Regards
Markus

Steps to reproduce:

This response will cause URLCache.storeCachedResponse(_, for) to be called:

Code Block < HTTP/1.0 200 OK
< Content-Type: application/protobuf
< Content-Length: 1
< Cache-Control: max-age=20

This response will not cause any call to URLCache.storeCachedResponse(_, for):

Code Block < HTTP/1.0 200 OK
< Content-Type: application/protobuf
< Content-Length: 0
< Cache-Control: max-age=20

Boost

Answer 1

DTS Engineer OP

Apple

May ’21

Is there a reason why 0-sized response are not stored in cache? Or is
it a bug?

I’m not sure what’s going on here but I definitely think its bugworthy. You should file a bug, making sure to include your description of why it’s important that the system cache such responses. Please post your bug number, just for the record.

Share and Enjoy
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

1

Answer 2

MarkusEnglund OP

May ’21

I filed a bug report: https://feedbackassistant.apple.com/feedback/9101108

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