rewritten redirect with relative url

[Dave Bailey]

Hi,

In ngx_http_upstream_rewrite_location(), r->upstream->rewrite_redirect may
replace the Location header value with a new value.  This value ends up
going through ngx_http_header_filter(), and if it's a relative URL, the
header filter adds a scheme and host to it.  However, if
r->upstream->rewrite_redirect declines (rc = NGX_DECLINED) to rewrite the
redirect, the value does not go through ngx_http_header_filter() even if it
is a relative URL.

Is this intended behavior?  If it is not, I attached a patch that sets
r->headers_out.location consistently.

-dave
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