Increased maximum read PROXY protocol header size. Maximum size for reading the PROXY protocol header is increased to 4096 to accommodate a bigger number of TLVs, which are supported since cca4c8a715de. Maximum size for writing the PROXY protocol header is not changed since only version 1 is currently supported.

--- a/src/core/ngx_proxy_protocol.c
+++ b/src/core/ngx_proxy_protocol.c
@@ -281,7 +281,7 @@ ngx_proxy_protocol_write(ngx_connection_
 {
     ngx_uint_t  port, lport;
 
-    if (last - buf < NGX_PROXY_PROTOCOL_MAX_HEADER) {
+    if (last - buf < NGX_PROXY_PROTOCOL_V1_MAX_HEADER) {
         return NULL;
     }