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import json
import base64
# A 1x1 PNG image.
# Source: https://commons.wikimedia.org/wiki/File:1x1.png (Public Domain)
IMAGE = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII="
def main(request, response):
response.headers.set(b'Access-Control-Allow-Origin', b'*')
response.headers.set(b'Access-Control-Allow-Methods', b'OPTIONS, GET, POST')
response.headers.set(b'Access-Control-Allow-Headers', b'Content-Type')
# CORS preflight
if request.method == u'OPTIONS':
return u''
if b'true' == request.GET.get(b'revalidate', None):
response.headers.set(b'Cache-Control', b'max-age=0, must-revalidate')
else:
response.headers.set(b'Cache-Control', b'max-age=3600');
if b'some-etag' == request.headers.get(b'If-None-Match', None):
response.status = 304
return u''
if request.GET.get(b'corp-cross-origin', None):
response.headers.set(b'Cross-Origin-Resource-Policy', b'cross-origin')
response.headers.set(b'Etag', b'some-etag')
response.headers.set(b'Content-Type', b'image/png')
return base64.b64decode(IMAGE)
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