altsvc: clone setting in curl_easy_duphandlebagder/altsvc-duphandle

The cache content is not duplicated, like other caches, but the setting
and specified file name are.

Test 1908 is extended to verify this somewhat. Since the duplicated
handle gets the same file name, the test unfortunately overwrites the
same file twice (with different contents) which makes it hard to check
automatically.

Closes #5923

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/libtest/lib1908.c b/tests/libtest/lib1908.c
index bacbc9710..30e7d8019 100644
--- a/tests/libtest/lib1908.c
+++ b/tests/libtest/lib1908.c
@@ -39,7 +39,22 @@ int test(char *URL)
     curl_easy_setopt(hnd, CURLOPT_NOPROGRESS, 1L);
     curl_easy_setopt(hnd, CURLOPT_ALTSVC, "log/altsvc-1908");
     ret = curl_easy_perform(hnd);
+
+    if(!ret) {
+      /* make a copy and check that this also has alt-svc activated */
+      CURL *also = curl_easy_duphandle(hnd);
+      if(also) {
+        ret = curl_easy_perform(also);
+        /* we close the second handle first, which makes it store the alt-svc
+           file only to get overwritten when the next handle is closed! */
+        curl_easy_cleanup(also);
+      }
+    }
+
     curl_easy_reset(hnd);
+
+    /* using the same file name for the alt-svc cache, this clobbers the
+       content just written from the 'also' handle */
     curl_easy_cleanup(hnd);
   }
   curl_global_cleanup();