test: move http header related tests from io tests to spec tests

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

test/io/__snapshots__/test_cli/test_schema_cache_snapshot[dbRoutines].yaml

@@ -196,23 +196,6 @@
       pdSchema: public
       pdVolatility: Volatile
 
-- - qiName: custom_vary_hdr
-    qiSchema: public
-  - - pdDescription: null
-      pdFuncSettings: []
-      pdHasVariadic: false
-      pdName: custom_vary_hdr
-      pdParams: []
-      pdReturnType:
-        contents:
-          contents:
-            qiName: void
-            qiSchema: pg_catalog
-          tag: Scalar
-        tag: Single
-      pdSchema: public
-      pdVolatility: Volatile
-
 - - qiName: get_postgres_version
     qiSchema: public
   - - pdDescription: null

test/io/fixtures/schema.sql

@@ -259,13 +259,6 @@ create or replace function notify_pgrst() returns void as $$
   notify pgrst;
 $$ language sql;
 
-
-create or replace function custom_vary_hdr() returns void as $$
-  begin
-    perform set_config('response.headers', '[{"Vary": "X-Test-Accept"}]', false);
-  end
-$$ language plpgsql;
-
 create or replace function get_work_mem() returns text as $$
   select current_setting('work_mem', true);
 $$ language sql;

test/io/test_io.py

@@ -2087,26 +2087,6 @@ def test_client_error_verbosity_config(defaultenv):
         }
 
 
-def test_vary_custom_header_set(defaultenv):
-    "Test default Vary header value is overridden in pre-request database function"
-
-    env = {**defaultenv, "PGRST_DB_PRE_REQUEST": "custom_vary_hdr"}
-
-    with run(env=env) as postgrest:
-        response = postgrest.session.get("/projects")
-
-        assert response.headers["Vary"] == "X-Test-Accept"
-
-
-def test_vary_default_header_set(defaultenv):
-    "Test default Vary header value matches default one"
-
-    with run(env=defaultenv) as postgrest:
-        response = postgrest.session.get("/projects")
-
-        assert response.headers["Vary"] == "Accept, Prefer, Range"
-
-
 def test_positive_pool_metric(defaultenv):
     "When a network failure is caused on the pg connection, pgrst_db_pool_available stays positive"