the "proxy_hide_header" and "fastcgi_hide_header" directives did not
hide response header lines whose name was longer than 32 characters

src/http/modules/ngx_http_fastcgi_module.c

diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index ac14d75..c63c0f3 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -1135,7 +1135,7 @@
 
                 } else {
                     for (i = 0; i < h->key.len; i++) {
-                        h->lowcase_key[i] = ngx_tolower(h->lowcase_key[i]);
+                        h->lowcase_key[i] = ngx_tolower(h->key.data[i]);
                     }
                 }
 

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 61b934f..298d766 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1141,7 +1141,7 @@
 
             } else {
                 for (i = 0; i < h->key.len; i++) {
-                    h->lowcase_key[i] = ngx_tolower(h->lowcase_key[i]);
+                    h->lowcase_key[i] = ngx_tolower(h->key.data[i]);
                 }
             }