merge r3452, r3462, r3471, r3472: fix miscellaneous name bugs: *) fix $upstream_http_ variable prefix length *) use a right "Location" header name, however, it did not harm, since ngx_http_variable_sent_location() never use key name field *) fix proxy_redirect name in error message *) "proxy_redirect default" may not be used if a proxy_pass uses variables

# Copyright (C) Igor Sysoev


cat << END >> $NGX_AUTO_HEADERS_H

#ifndef $have
#define $have  1
#endif

END