Proxy: $proxy_internal_body_length fixed. The $proxy_internal_body_length value might change during request lifetime, notably if proxy_set_body used, and use of a cached value might result in incorrect upstream requests. Patch by Lanshun Zhou.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_SUPPRESS_WARN . auto/have

have=NGX_SMP . auto/have