Created
December 29, 2008 20:15
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class AppEngineFetcher(fetchers.HTTPFetcher): | |
"""An HTTPFetcher subclass that uses Google App Engine's urlfetch module. | |
""" | |
def fetch(self, url, body=None, headers=None): | |
if not fetchers._allowedURL(url): | |
raise ValueError('Bad URL scheme: %r' % (url,)) | |
if not headers: | |
headers = {} | |
if body: | |
method = urlfetch.POST | |
headers['Content-type'] = 'application/x-www-form-urlencoded' | |
else: | |
method = urlfetch.GET | |
count = 0 | |
resp = urlfetch.fetch(url, body, method, headers=headers) | |
# follow redirects for a while | |
while resp.status_code in [301,302]: | |
count += 1 | |
if count >= 3: | |
raise Exception('too many redirects') | |
if resp.headers.has_key('location'): | |
url = resp.headers['location'] | |
elif resp.headers.has_key('Location'): | |
url = resp.headers['Location'] | |
else: | |
raise Exception('Could not find location in headers: %r' % (resp.headers,)) | |
resp = urlfetch.fetch(url, body, method, headers=headers) | |
# normalize headers | |
for key, val in resp.headers.items(): | |
resp.headers[key.lower()] = val | |
return fetchers.HTTPResponse(url, resp.status_code, resp.headers, resp.content) |
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