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