Resolve headers on different renderers - Issue 2749 (#2774)

* Resolve headers on different renderers - Issue 2749

* Make pretty

sanic/errorpages.py

@@ -92,8 +92,10 @@ class BaseRenderer:
             self.full
             if self.debug and not getattr(self.exception, "quiet", False)
             else self.minimal
-        )
+        )()
-        return output()
+        output.status = self.status
+        output.headers.update(self.headers)
+        return output
 
     def minimal(self) -> HTTPResponse:  # noqa
         """
@@ -125,7 +127,7 @@ class HTMLRenderer(BaseRenderer):
             request=self.request,
             exc=self.exception,
         )
-        return html(page.render(), status=self.status, headers=self.headers)
+        return html(page.render())
 
     def minimal(self) -> HTTPResponse:
         return self.full()
@@ -146,8 +148,7 @@ class TextRenderer(BaseRenderer):
                 text=self.text,
                 bar=("=" * len(self.title)),
                 body=self._generate_body(full=True),
-            ),
+            )
-            status=self.status,
         )
 
     def minimal(self) -> HTTPResponse:
@@ -157,9 +158,7 @@ class TextRenderer(BaseRenderer):
                 text=self.text,
                 bar=("=" * len(self.title)),
                 body=self._generate_body(full=False),
-            ),
+            )
-            status=self.status,
-            headers=self.headers,
         )
 
     @property
@@ -218,11 +217,11 @@ class JSONRenderer(BaseRenderer):
 
     def full(self) -> HTTPResponse:
         output = self._generate_output(full=True)
-        return json(output, status=self.status, dumps=self.dumps)
+        return json(output, dumps=self.dumps)
 
     def minimal(self) -> HTTPResponse:
         output = self._generate_output(full=False)
-        return json(output, status=self.status, dumps=self.dumps)
+        return json(output, dumps=self.dumps)
 
     def _generate_output(self, *, full):
         output = {

tests/test_errorpages.py

@@ -527,3 +527,26 @@ def test_guess_mime_logging(
     ]
 
     assert logmsg == expected
+
+
+@pytest.mark.parametrize(
+    "format,expected",
+    (
+        ("html", "text/html; charset=utf-8"),
+        ("text", "text/plain; charset=utf-8"),
+        ("json", "application/json"),
+    ),
+)
+def test_exception_header_on_renderers(app: Sanic, format, expected):
+    app.config.FALLBACK_ERROR_FORMAT = format
+
+    @app.get("/test")
+    def test(request):
+        raise SanicException(
+            "test", status_code=400, headers={"exception": "test"}
+        )
+
+    _, response = app.test_client.get("/test")
+    assert response.status == 400
+    assert response.headers.get("exception") == "test"
+    assert response.content_type == expected