Merge branch 'bugfix/fix_call_to_header_event_callback_v5.1' into 'release/v5.1'

fix: Fix call to event_handler on on_header state of HTTP Client (v5.1)

See merge request espressif/esp-idf!29955

Author: jack0c

components/esp_http_client/esp_http_client.c

@@ -233,6 +233,7 @@ static int http_on_header_event(esp_http_client_handle_t client)
 static int http_on_header_field(http_parser *parser, const char *at, size_t length)
 {
     esp_http_client_t *client = parser->data;
+    http_on_header_event(client);
     http_utils_append_string(&client->current_header_key, at, length);
 
     return 0;
@@ -253,7 +254,6 @@ static int http_on_header_value(http_parser *parser, const char *at, size_t leng
         http_utils_append_string(&client->auth_header, at, length);
     }
     http_utils_append_string(&client->current_header_value, at, length);
-    http_on_header_event(client);
     return 0;
 }