Perl: avoid returning 500 if header was already sent.

Returning NGX_HTTP_INTERNAL_SERVER_ERROR if a perl code died after
sending header will lead to a "header already sent" alert.  To avoid
it, we now check if header was already sent, and return NGX_ERROR
instead if it was.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/http/modules/perl/ngx_http_perl_module.c b/src/http/modules/perl/ngx_http_perl_module.c
index 81b2526ad..dc2125935 100644
--- a/src/http/modules/perl/ngx_http_perl_module.c
+++ b/src/http/modules/perl/ngx_http_perl_module.c
@@ -780,6 +780,10 @@ ngx_http_perl_call_handler(pTHX_ ngx_http_request_t *r,
 
         ctx->redirect_uri.len = 0;
 
+        if (ctx->header_sent) {
+            return NGX_ERROR;
+        }
+
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }