"""Manage HTTP Response Headers
Much of this module is red-handedly pilfered from email.message in the stdlib,
so portions are Copyright (C) 2001,2002 Python Software Foundation, and were
# Regular expression that matches `special' characters in parameters, the
# existence of which force quoting of the parameter value.
tspecials = re.compile(r'[ \(\)<>@,;:\\"/\[\]\?=]')
def _formatparam(param, value=None, quote=1):
"""Convenience function to format and return a key=value pair.
This will quote the value if needed or if quote is true.
if value is not None and len(value) > 0:
if quote or tspecials.search(value):
value = value.replace('\\', '\\\\').replace('"', r'\"')
return '%s="%s"' % (param, value)
return '%s=%s' % (param, value)
"""Manage a collection of HTTP response headers"""
def __init__(self, headers=None):
headers = headers if headers is not None else []
if type(headers) is not list:
raise TypeError("Headers must be a list of name/value tuples")
self._convert_string_type(k)
self._convert_string_type(v)
def _convert_string_type(self, value):
"""Convert/check value type."""
raise AssertionError("Header names/values must be"
" of type str (got {0})".format(repr(value)))
"""Return the total number of headers, including duplicates."""
return len(self._headers)
def __setitem__(self, name, val):
"""Set the value of a header."""
(self._convert_string_type(name), self._convert_string_type(val)))
def __delitem__(self,name):
"""Delete all occurrences of a header, if present.
Does *not* raise an exception if the header is missing.
name = self._convert_string_type(name.lower())
self._headers[:] = [kv for kv in self._headers if kv[0].lower() != name]
def __getitem__(self,name):
"""Get the first header value for 'name'
Return None if the header is missing instead of raising an exception.
Note that if the header appeared multiple times, the first exactly which
occurrence gets returned is undefined. Use getall() to get all
the values matching a header field name.
def __contains__(self, name):
"""Return true if the message contains the header."""
return self.get(name) is not None
"""Return a list of all the values for the named field.
These will be sorted in the order they appeared in the original header
list or were added to this instance, and may contain duplicates. Any
fields deleted and re-inserted are always appended to the header list.
If no fields exist with the given name, returns an empty list.
name = self._convert_string_type(name.lower())
return [kv[1] for kv in self._headers if kv[0].lower()==name]
def get(self,name,default=None):
"""Get the first header value for 'name', or return 'default'"""
name = self._convert_string_type(name.lower())
for k,v in self._headers:
"""Return a list of all the header field names.
These will be sorted in the order they appeared in the original header
list, or were added to this instance, and may contain duplicates.
Any fields deleted and re-inserted are always appended to the header
return [k for k, v in self._headers]
"""Return a list of all header values.
These will be sorted in the order they appeared in the original header
list, or were added to this instance, and may contain duplicates.
Any fields deleted and re-inserted are always appended to the header
return [v for k, v in self._headers]
"""Get all the header fields and values.
These will be sorted in the order they were in the original header
list, or were added to this instance, and may contain duplicates.
Any fields deleted and re-inserted are always appended to the header
return "%s(%r)" % (self.__class__.__name__, self._headers)
"""str() returns the formatted headers, complete with end line,
suitable for direct HTTP transmission."""
return '\r\n'.join(["%s: %s" % kv for kv in self._headers]+['',''])
return str(self).encode('iso-8859-1')
def setdefault(self,name,value):
"""Return first matching header value for 'name', or 'value'
If there is no header named 'name', add a new header with name 'name'
self._headers.append((self._convert_string_type(name),
self._convert_string_type(value)))
def add_header(self, _name, _value, **_params):
"""Extended header setting.
_name is the header field to add. keyword arguments can be used to set
additional parameters for the header field, with underscores converted
to dashes. Normally the parameter will be added as key="value" unless
value is None, in which case only the key will be added.
h.add_header('content-disposition', 'attachment', filename='bud.gif')
Note that unlike the corresponding 'email.message' method, this does
*not* handle '(charset, language, value)' tuples: all values must be
_value = self._convert_string_type(_value)
for k, v in _params.items():
k = self._convert_string_type(k)
parts.append(k.replace('_', '-'))
v = self._convert_string_type(v)
parts.append(_formatparam(k.replace('_', '-'), v))
self._headers.append((self._convert_string_type(_name), "; ".join(parts)))
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
