| #!/usr/bin/env python |
| |
| # A header used to correlate requests and responses |
| state_header = b"content-language" |
| |
| # Static ETag to use (and expect) |
| etag = b"abcdef" |
| |
| def error(msg): |
| return (299, u"Client Error"), [ |
| (b'content-type', b'text/plain'), |
| (b'access-control-allow-origin', b"*"), |
| (b'access-control-expose-headers', state_header), |
| (b'cache-control', b'no-store') |
| ], msg |
| |
| def main(request, response): |
| headers = [] |
| |
| inm = request.headers.get(b'if-none-match', None) |
| raw_req_num = request.headers.get(state_header, None) |
| if raw_req_num == None: |
| return error(u"no req_num header in request") |
| else: |
| req_num = int(raw_req_num) |
| if req_num > 8: |
| return error(u"req_num %s out of range" % req_num) |
| |
| headers.append((b"Access-Control-Expose-Headers", state_header)) |
| headers.append((state_header, req_num)) |
| headers.append((b"A", req_num)) |
| headers.append((b"B", req_num)) |
| |
| if req_num % 2: # odd requests are the first in a test pair |
| if inm: |
| # what are you doing here? This should be a fresh request. |
| return error(u"If-None-Match on first request") |
| else: |
| status = 200, b"OK" |
| headers.append((b"Access-Control-Allow-Origin", b"*")) |
| headers.append((b"Content-Type", b"text/plain")) |
| headers.append((b"Cache-Control", b"private, max-age=3, must-revalidate")) |
| headers.append((b"ETag", etag)) |
| return status, headers, b"Success" |
| else: # even requests are the second in a pair, and should have a good INM. |
| if inm != etag: |
| # Bad browser. |
| if inm == None: |
| return error(u"If-None-Match missing") |
| else: |
| return error(u"If-None-Match '%s' mismatches") |
| else: |
| if req_num == 2: |
| pass # basic, vanilla check |
| elif req_num == 4: |
| headers.append((b"Access-Control-Expose-Headers", b"a, b")) |
| elif req_num == 6: |
| headers.append((b"Access-Control-Expose-Headers", b"a")) |
| elif req_num == 8: |
| headers.append((b"Access-Control-Allow-Origin", b"other.origin.example:80")) |
| status = 304, b"Not Modified" |
| return status, headers, b"" |
