def send_headers(self):
"""Assert, process, and send the HTTP response message-headers."""
hkeys = [key.lower() for key, value in self.outheaders]
status = int(self.status[:3])
if status == 413:
# Request Entity Too Large. Close conn to avoid garbage.
self.close_connection = True
elif "content-length" not in hkeys:
# "All 1xx (informational), 204 (no content),
# and 304 (not modified) responses MUST NOT
# include a message-body." So no point chunking.
if status < 200 or status in (204, 205, 304):
pass
else:
if self.response_protocol == 'HTTP/1.1':
# Use the chunked transfer-coding
self.chunked_write = True
self.outheaders.append(("Transfer-Encoding", "chunked"))
else:
# Closing the conn is the only way to determine len.
self.close_connection = True
if "connection" not in hkeys:
if self.response_protocol == 'HTTP/1.1':
if self.close_connection:
self.outheaders.append(("Connection", "close"))
else:
if not self.close_connection:
self.outheaders.append(("Connection", "Keep-Alive"))
if "date" not in hkeys:
self.outheaders.append(("Date", rfc822.formatdate()))
server = self.connection.server
if "server" not in hkeys:
self.outheaders.append(("Server", server.version))
buf = [server.protocol, " ", self.status, "\r\n"]
try:
buf += [k + ": " + v + "\r\n" for k, v in self.outheaders]
except TypeError:
if not isinstance(k, str):
raise TypeError("WSGI response header key %r is not a string.")
if not isinstance(v, str):
raise TypeError("WSGI response header value %r is not a string.")
else:
raise
buf.append("\r\n")
self.sendall("".join(buf))
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