Improve handling of unconsumed request bodies at end of http1 requests

[zarqman]

This PR includes 2 related items:

1. Fixes an old regression where request = nil should be conditional upon the request body, but was incorrectly the response body. Looking at the git history, the original behavior was ... unless request.body and was changed in b3cc9ce, seemingly accidentally during a refactor.

   I occasionally experience random hangs when running my test suite and believe this might be one cause of them.

2. Changes the handling of unconsumed bodies from request.finish to request.each{}.

   finish buffers the request fully in memory as a Buffered, causing needless memory bloat in the ruby process. Using each skips the buffering, but is otherwise behaves the same.

Types of Changes

• Bug fix.

Contribution

• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.

[zarqman]

Revised to remove the previous attempt at request.close as further testing shows it might be causing a regression. Instead, using request.each{} which functions like the original call to request.finish except that it avoids buffering the request body into memory.

[ioquatix]

This seems reasonable to me, thanks for investigating the history.