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commit cd5254fec4e3b20d2c2ea3bc8be7cadbf1790f10
parent 463c9bd45f5a8c8864a799a9bfc6770ffb3c8155
Author: Christian Grothoff <grothoff@gnunet.org>
Date:   Sun, 16 Aug 2026 08:25:24 +0200

add Vary headers to SPA responses

Diffstat:
M
src/mhd/mhd2_spa.c
 | 
13
+++++++++++++
M
src/mhd/mhd_spa.c
 | 
7
+++++++

2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/src/mhd/mhd2_spa.c b/src/mhd/mhd2_spa.c
@@ -252,6 +252,15 @@ build_webui (void *cls,
                         MHD_response_add_header (zresponse,
                                                  MHD_HTTP_HEADER_CONTENT_TYPE,
                                                  mime));
+        /* Which representation we return depends on the
+           Accept-Encoding header of the client, so shared caches
+           must not serve one variant to a client that asked for
+           another. */
+        if (NULL != zresponse)
+          GNUNET_break (MHD_SC_OK ==
+                        MHD_response_add_header (zresponse,
+                                                 MHD_HTTP_HEADER_VARY,
+                                                 MHD_HTTP_HEADER_ACCEPT_ENCODING));
       }
     }
     else
@@ -282,6 +291,10 @@ build_webui (void *cls,
                   MHD_response_add_header (response,
                                            MHD_HTTP_HEADER_CONTENT_TYPE,
                                            mime));
+  GNUNET_break (MHD_SC_OK ==
+                MHD_response_add_header (response,
+                                         MHD_HTTP_HEADER_VARY,
+                                         MHD_HTTP_HEADER_ACCEPT_ENCODING));
 
   {
     struct WebuiFile *w;
diff --git a/src/mhd/mhd_spa.c b/src/mhd/mhd_spa.c
@@ -258,6 +258,13 @@ build_webui (void *cls,
                                            MHD_HTTP_HEADER_CONTENT_TYPE,
                                            mime));
   }
+  /* Which representation we return depends on the Accept-Encoding
+     header of the client, so shared caches must not serve one
+     variant to a client that asked for another. */
+  GNUNET_break (MHD_YES ==
+                MHD_add_response_header (response,
+                                         MHD_HTTP_HEADER_VARY,
+                                         MHD_HTTP_HEADER_ACCEPT_ENCODING));
 
   {
     struct WebuiFile *w;