[TS-3980] Investigate and remove the empty doc cache setting

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Component/s: Cache
• Assignee: Unassigned
• Reporter: Sudheer Vinukonda
• Created: 23/Oct/15 15:34
• Updated: 17/Aug/16 15:46
• Resolved: 17/Aug/16 15:46

Description

Refer TS-3978, TS-3979

Caching of empty docs is slightly trickier on ATS, since, it is not clear whether the empty body is a real empty response from the Origin server or a consequence of broken response (connection). Currently, this is controlled via a config setting allow_empty_doc with additional logic such as Content-Length=0 to make sure it's a valid empty response from Origin server.

The current logic however misses handling valid empty response with no Content-Length=0 header (e.g Chunked TE, SPDY/H2 outbound etc).

Opening jira to investigate how to safely (i.e ensuring the response is not a result of broken connection) remove the allow_empty_doc setting and to be able to generically cache empty docs similar to any other response.

Issue Links

• duplicates: TS-3978 Allow empty document caching to follow normal logic
• is related to: TS-3979 Deprecate allow empty doc cache setting.