[njs] HTTP: returing undefined for Content-Type when the header is absent.

[Dmitry Volyntsev]

details:   https://hg.nginx.org/njs/rev/cf267407eabe
branches:  
changeset: 1879:cf267407eabe
user:      Dmitry Volyntsev <xeioex at nginx.com>
date:      Tue Jun 07 21:30:57 2022 -0700
description:
HTTP: returing undefined for Content-Type when the header is absent.

This unifies empty response value type for r.headersOut.

diffstat:

 nginx/ngx_http_js_module.c |  12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diffs (29 lines):

diff -r 6ef77c24c924 -r cf267407eabe nginx/ngx_http_js_module.c
--- a/nginx/ngx_http_js_module.c	Mon Jun 06 23:27:11 2022 -0700
+++ b/nginx/ngx_http_js_module.c	Tue Jun 07 21:30:57 2022 -0700
@@ -1978,6 +1978,12 @@ ngx_http_js_content_type(njs_vm_t *vm, n
 
     if (retval != NULL && setval == NULL) {
         hdr = &r->headers_out.content_type;
+
+        if (hdr->len == 0) {
+            njs_value_undefined_set(retval);
+            return NJS_OK;
+        }
+
         return njs_vm_value_string_set(vm, retval, hdr->data, hdr->len);
     }
 
@@ -3764,6 +3770,12 @@ ngx_http_js_content_type(njs_vm_t *vm, n
 
     if (retval != NULL && setval == NULL) {
         hdr = &r->headers_out.content_type;
+
+        if (hdr->len == 0) {
+            njs_value_undefined_set(retval);
+            return NJS_OK;
+        }
+
         return njs_vm_value_string_set(vm, retval, hdr->data, hdr->len);
     }