diff --git a/nginx_module/src/http_request.rs b/nginx_module/src/http_request.rs
index 76e625a..6bd6f5d 100644
--- a/nginx_module/src/http_request.rs
+++ b/nginx_module/src/http_request.rs
@@ -627,7 +627,7 @@ impl<'a> HeaderList<'a> {
                 std::slice::from_raw_parts_mut(part.elts as *mut ngx_table_elt_t, part.nelts)
             };
             for elem in elems {
-                if unsafe { NgxStr::from_raw(elem.key) } == name {
+                if unsafe { NgxStr::from_raw(elem.key) }.eq_ignore_ascii_case(&name) {
                     elem.value = value.inner();
                 }
             }
diff --git a/nginx_module/src/ngx_str.rs b/nginx_module/src/ngx_str.rs
index f480a6b..3b6a06b 100644
--- a/nginx_module/src/ngx_str.rs
+++ b/nginx_module/src/ngx_str.rs
@@ -183,6 +183,10 @@ impl<'a> NgxStr<'a> {
     pub const fn is_empty(self) -> bool {
         self.inner.len == 0
     }
+
+    pub fn eq_ignore_ascii_case(self, other: &NgxStr<'_>) -> bool {
+        self.as_bytes().eq_ignore_ascii_case(other.as_bytes())
+    }
 }
 
 impl<'a> Builder<'a> {