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Unified Diff: venv/Lib/site-packages/django/middleware/http.py

Issue 554060043: testMe
Patch Set: Created 2 years, 10 months ago
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Index: venv/Lib/site-packages/django/middleware/http.py
===================================================================
new file mode 100644
--- /dev/null
+++ b/venv/Lib/site-packages/django/middleware/http.py
@@ -0,0 +1,45 @@
+from django.utils.cache import (
+ cc_delim_re, get_conditional_response, set_response_etag,
+)
+from django.utils.deprecation import MiddlewareMixin
+from django.utils.http import parse_http_date_safe
+
+
+class ConditionalGetMiddleware(MiddlewareMixin):
+ """
+ Handles conditional GET operations. If the response has an ETag or
+ Last-Modified header, and the request has If-None-Match or
+ If-Modified-Since, the response is replaced by an HttpNotModified. An ETag
+ header is added if needed.
+ """
+ def process_response(self, request, response):
+ # It's too late to prevent an unsafe request with a 412 response, and
+ # for a HEAD request, the response body is always empty so computing
+ # an accurate ETag isn't possible.
+ if request.method != 'GET':
+ return response
+
+ if self.needs_etag(response) and not response.has_header('ETag'):
+ set_response_etag(response)
+
+ etag = response.get('ETag')
+ last_modified = response.get('Last-Modified')
+ if last_modified:
+ last_modified = parse_http_date_safe(last_modified)
+
+ if etag or last_modified:
+ return get_conditional_response(
+ request,
+ etag=etag,
+ last_modified=last_modified,
+ response=response,
+ )
+
+ return response
+
+ def needs_etag(self, response):
+ """
+ Return True if an ETag header should be added to response.
+ """
+ cache_control_headers = cc_delim_re.split(response.get('Cache-Control', ''))
+ return all(header.lower() != 'no-store' for header in cache_control_headers)
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