Implemented HEAD requests, removed Sanic InvalidUsage

datasette/app.py

@@ -12,7 +12,7 @@ from pathlib import Path
 import click
 from markupsafe import Markup
 from jinja2 import ChoiceLoader, Environment, FileSystemLoader, PrefixLoader
-from sanic.exceptions import InvalidUsage, NotFound
+from sanic.exceptions import NotFound
 
 from .views.base import DatasetteError, ureg, AsgiRouter
 from .views.database import DatabaseDownload, DatabaseView
@@ -665,10 +665,6 @@ class Datasette:
                     status = 404
                     info = {}
                     message = exception.args[0]
-                elif isinstance(exception, InvalidUsage):
-                    status = 405
-                    info = {}
-                    message = exception.args[0]
                 elif isinstance(exception, DatasetteError):
                     status = exception.status
                     info = exception.error_dict

datasette/views/base.py

@@ -54,6 +54,11 @@ class DatasetteError(Exception):
 class BaseView(AsgiView):
     ds = None
 
+    async def head(self, *args, **kwargs):
+        response = await self.get(*args, **kwargs)
+        response.body = b""
+        return response
+
     def _asset_urls(self, key, template, context):
         # Flatten list-of-lists from plugins:
         seen_urls = set()

tests/fixtures.py

@@ -37,10 +37,10 @@ class TestClient:
         self.asgi_app = asgi_app
 
     @async_to_sync
-    async def get(self, path, allow_redirects=True, redirect_count=0):
-        return await self._get(path, allow_redirects, redirect_count)
+    async def get(self, path, allow_redirects=True, redirect_count=0, method="GET"):
+        return await self._get(path, allow_redirects, redirect_count, method)
 
-    async def _get(self, path, allow_redirects=True, redirect_count=0):
+    async def _get(self, path, allow_redirects=True, redirect_count=0, method="GET"):
         query_string = b""
         if "?" in path:
             path, _, query_string = path.partition("?")
@@ -50,7 +50,7 @@ class TestClient:
             {
                 "type": "http",
                 "http_version": "1.0",
-                "method": "GET",
+                "method": method,
                 "path": unquote(path),
                 "raw_path": path.encode("ascii"),
                 "query_string": query_string,

tests/test_html.py

@@ -46,6 +46,11 @@ def test_homepage(app_client_two_attached_databases):
     ] == table_links
 
 
+def test_http_head(app_client):
+    response = app_client.get("/", method="HEAD")
+    assert response.status == 200
+
+
 def test_static(app_client):
     response = app_client.get("/-/static/app2.css")
     assert response.status == 404