Python Manual User Manual
Processing Content
99
been derived from the
Agent
class, this would include calling the "
destroyReferences()
"
member function.
Processing Content
If the function of a HTTP servlet entails that the content associated with a request be processed in some
way, it will be necessary to override the "
way, it will be necessary to override the "
processContent()
" member function. The "
process-
Content()
" member function will only be called subsequent to "
processRequest()
" being
called, and only provided that "
processRequest()
" hadn’t already dealt with the request and sent
a complete response.
As the means to determine how much content to expect is dependent on the specifics of a request, no
attempt is made to first accumulate the content into one block. Instead, the "
attempt is made to first accumulate the content into one block. Instead, the "
processContent()
"
member function will be called multiple times if appropriate, once for each block of data which is read
in. It is up to the "
in. It is up to the "
processContent()
" member function to accumulate the data or otherwise proc-
ess it, until it determines that all content has been received.
Typically, how much content is expected will be dictated by the presence of a HTTP content length
header, or by a MIME multipart message boundary string as specificed in a HTTP content type header.
Either way, it is up to the specific implementation of a HTTP servlet to know what to expect and deal
with it appropriately.
header, or by a MIME multipart message boundary string as specificed in a HTTP content type header.
Either way, it is up to the specific implementation of a HTTP servlet to know what to expect and deal
with it appropriately.
class FormServlet(netsvc.HttpServlet):
def processRequest(self):
if self.requestMethod() not in ["GET","POST"]:
self.sendError(501,"Request method type is not supported.")
elif self.requestMethod() == "POST" \
and self.contentLength() < 0:
self.sendError(400,"Content length required for POST.")
elif self.requestMethod() == "GET":
self._environ = {}
self._content = []
self._contentLength = 0
self._headers = self.headers()
self._environ["REQUEST_METHOD"] = self.requestMethod()
self._environ["QUERY_STRING"] = self.queryString()
self._headers["content-type"] = \
"application/x-www-form-urlencoded"
try:
form = cgi.FieldStorage(headers=self._headers, \
environ=self._environ,keep_blank_values=1)
self.processForm(form)
except:
netsvc.logException()
self.shutdown()
elif self.contentLength() == 0:
self.processContent("")