src/http/modules/ngx_http_proxy_module.c:3931: error: Uninitialized Value
  The value read from cv.lengths was never initialized.

src/http/modules/ngx_http_proxy_module.c:3931:9: 
3929.     }
3930. 
3931.     if (cv.lengths != NULL) {
              ^
3932. 
3933.         plcf->upstream.cache_value = ngx_palloc(cf->pool,
