Copy regex unnamed captures to cloned subrequests.

Previously, unnamed regex captures matched in the parent request, were not
available in a cloned subrequest.  Now 3 fields related to unnamed captures
are copied to a cloned subrequest: r->ncaptures, r->captures and
r->captures_data.  Since r->captures cannot be changed by either request after
creating a clone, a new flag r->realloc_captures is introduced to force
reallocation of r->captures.

The issue was reported as a proxy_cache_background_update misbehavior in
http://mailman.nginx.org/pipermail/nginx/2018-December/057251.html.
3 files changed
tree: 3d0fb8a6a475c69bab1971030fe52142523f54bb
  1. auto/
  2. conf/
  3. contrib/
  4. docs/
  5. misc/
  6. src/
  7. .hgtags