API calls need HTTP/1.1 for some strange reason

.gitlab-ci.yml

@@ -112,7 +112,7 @@ deploy:documentation:
     - tags
     - triggers
   script:
-    - "curl --request POST --form token=$WEBSITE_TOKEN --form ref=master --form \"variables[RELEASE_CI_BUILD_REF_NAME]=$CI_BUILD_REF_NAME\" --form \"variables[RELEASE_CI_BUILD_ID]=$CI_BUILD_ID\" https://gitlab.labs.nic.cz/api/v3/projects/5/trigger/builds"
+    - "curl --http1.1 --request POST --form token=$WEBSITE_TOKEN --form ref=master --form \"variables[RELEASE_CI_BUILD_REF_NAME]=$CI_BUILD_REF_NAME\" --form \"variables[RELEASE_CI_BUILD_ID]=$CI_BUILD_ID\" https://gitlab.labs.nic.cz/api/v3/projects/5/trigger/builds"
   artifacts:
     name: "knot-dns-$CI_BUILD_REF_NAME-doc"
     paths: