Package cherrypy :: Module _cprequest :: Class Request
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Class Request

source code

object --+
         |
        Request

An HTTP request.

This object represents the metadata of an HTTP request message; that is, it contains attributes which describe the environment in which the request URL, headers, and body were sent (if you want tools to interpret the headers and body, those are elsewhere, mostly in Tools). This 'metadata' consists of socket data, transport characteristics, and the Request-Line. This object also contains data regarding the configuration in effect for the given URL, and the execution plan for generating a response.

Instance Methods [hide private]
 
error_response()
The no-arg callable which will handle unexpected, untrapped errors during request processing.
source code
 
__init__(self, local_host, remote_host, scheme='http', server_protocol='HTTP/1.1')
Populate a new Request object.
source code
 
close(self)
Run cleanup code.
source code
 
run(self, method, path, query_string, req_protocol, headers, rfile)
Process the Request.
source code
 
respond(self, path_info)
Generate a response for the resource at self.path_info.
source code
 
process_query_string(self)
Parse the query string into Python structures.
source code
 
process_headers(self)
Parse HTTP header data into Python structures.
source code
 
get_resource(self, path)
Call a dispatcher (which sets self.handler and .config).
source code
 
handle_error(self)
Handle the last unanticipated exception.
source code
 
_get_body_params(self) source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Variables [hide private]
  prev = None
The previous Request object (if any).
  local = httputil.Host('127.0.0.1', 80, '127.0.0.1')
An httputil.Host(ip, port, hostname) object for the server socket.
  remote = httputil.Host('127.0.0.1', 1111, '127.0.0.1')
An httputil.Host(ip, port, hostname) object for the client socket.
  scheme = 'http'
The protocol used between client and server.
  server_protocol = 'HTTP/1.1'
The HTTP version for which the HTTP server is at least conditionally compliant.
  base = ''
The (scheme://host) portion of the requested URL.
  request_line = ''
The complete Request-Line received from the client.
  method = 'GET'
Indicates the HTTP method to be performed on the resource identified by the Request-URI.
  query_string = ''
The query component of the Request-URI, a string of information to be interpreted by the resource.
  query_string_encoding = 'utf8'
The encoding expected for query string arguments after % HEX HEX decoding).
  protocol = (1, 1)
The HTTP protocol version corresponding to the set of features which should be allowed in the response.
  params = {}
A dict which combines query string (GET) and request entity (POST) variables.
  header_list = []
A list of the HTTP request headers as (name, value) tuples.
  headers = {}
A dict-like object containing the request headers.
  cookie = <SimpleCookie: >
See help(Cookie).
  rfile = None
If the request included an entity (body), it will be available as a stream in this attribute.
  process_request_body = True
If True, the rfile (if any) is automatically read and parsed, and the result placed into request.params or request.body.
  methods_with_bodies = ('POST', 'PUT')
A sequence of HTTP methods for which CherryPy will automatically attempt to read a body from the rfile.
  body = None
If the request Content-Type is 'application/x-www-form-urlencoded' or multipart, this will be None.
  dispatch = cherrypy.dispatch.Dispatcher()
The object which looks up the 'page handler' callable and collects config for the current request based on the path_info, other request attributes, and the application architecture.
  script_name = ''
The 'mount point' of the application which is handling this request.
  path_info = '/'
The 'relative path' portion of the Request-URI.
  login = None
When authentication is used during the request processing this is set to 'False' if it failed and to the 'username' value if it succeeded.
  app = None
The cherrypy.Application object which is handling this request.
  handler = None
The function, method, or other callable which CherryPy will call to produce the response.
  toolmaps = {}
A nested dict of all Toolboxes and Tools in effect for this request, of the form: {Toolbox.namespace: {Tool.name: config dict}}.
  config = None
A flat dict of all configuration entries which apply to the current request.
  is_index = None
This will be True if the current request is mapped to an 'index' resource handler (also, a 'default' handler if path_info ends with a slash).
  hooks = cherrypy._cprequest.HookMap(points=['before_error_resp...
A HookMap (dict-like object) of the form: {hookpoint: [hook, ...]}.
  error_page = {}
A dict of {error code: response filename or callable} pairs.
  show_tracebacks = True
If True, unexpected errors encountered during request processing will include a traceback in the response body.
  show_mismatched_params = True
If True, mismatched parameters encountered during PageHandler invocation processing will be included in the response body.
  throws = (<type 'exceptions.KeyboardInterrupt'>, <type 'except...
The sequence of exceptions which Request.run does not trap.
  throw_errors = False
If True, Request.run will not trap any errors (except HTTPRedirect and HTTPError, which are more properly called 'exceptions', not errors).
  closed = False
True once the close method has been called, False otherwise.
  stage = None
A string containing the stage reached in the request-handling process.
  namespaces = cherrypy.lib.reprconf.NamespaceSet({'hooks': <fun...
Properties [hide private]
  body_params
If the request Content-Type is 'application/x-www-form-urlencoded' or multipart, this will be a dict of the params pulled from the entity body; that is, it will be the portion of request.params that come from the message body (sometimes called "POST params", although they can be sent with various HTTP method verbs).

Inherited from object: __class__

Method Details [hide private]

error_response()

source code 

The no-arg callable which will handle unexpected, untrapped errors during request processing. This is not used for expected exceptions (like NotFound, HTTPError, or HTTPRedirect) which are raised in response to expected conditions (those should be customized either via request.error_page or by overriding HTTPError.set_response). By default, error_response uses HTTPError(500) to return a generic error response to the user-agent.

__init__(self, local_host, remote_host, scheme='http', server_protocol='HTTP/1.1')
(Constructor)

source code 

Populate a new Request object.

local_host should be an httputil.Host object with the server info. remote_host should be an httputil.Host object with the client info. scheme should be a string, either "http" or "https".

Overrides: object.__init__

close(self)

source code 

Run cleanup code. (Core)

run(self, method, path, query_string, req_protocol, headers, rfile)

source code 
Process the Request. (Core)

method, path, query_string, and req_protocol should be pulled directly
from the Request-Line (e.g. "GET /path?key=val HTTP/1.0").

path
    This should be %XX-unquoted, but query_string should not be.
    
    When using Python 2, they both MUST be byte strings,
    not unicode strings.
    
    When using Python 3, they both MUST be unicode strings,
    not byte strings, and preferably not bytes \x00-\xFF
    disguised as unicode.

headers
    A list of (name, value) tuples.

rfile
    A file-like object containing the HTTP request entity.

When run() is done, the returned object should have 3 attributes:

  * status, e.g. "200 OK"
  * header_list, a list of (name, value) tuples
  * body, an iterable yielding strings

Consumer code (HTTP servers) should then access these response
attributes to build the outbound stream.

respond(self, path_info)

source code 

Generate a response for the resource at self.path_info. (Core)

process_query_string(self)

source code 

Parse the query string into Python structures. (Core)

process_headers(self)

source code 

Parse HTTP header data into Python structures. (Core)

get_resource(self, path)

source code 

Call a dispatcher (which sets self.handler and .config). (Core)

handle_error(self)

source code 

Handle the last unanticipated exception. (Core)


Class Variable Details [hide private]

prev

The previous Request object (if any). This should be None unless we are processing an InternalRedirect.

Value:
None

scheme

The protocol used between client and server. In most cases, this will be either 'http' or 'https'.

Value:
'http'

base

The (scheme://host) portion of the requested URL. In some cases (e.g. when proxying via mod_rewrite), this may contain path segments which cherrypy.url uses when constructing url's, but which otherwise are ignored by CherryPy. Regardless, this value MUST NOT end in a slash.

Value:
''

request_line

The complete Request-Line received from the client. This is a single string consisting of the request method, URI, and protocol version (joined by spaces). Any final CRLF is removed.

Value:
''

method

Indicates the HTTP method to be performed on the resource identified by the Request-URI. Common methods include GET, HEAD, POST, PUT, and DELETE. CherryPy allows any extension method; however, various HTTP servers and gateways may restrict the set of allowable methods. CherryPy applications SHOULD restrict the set (on a per-URI basis).

Value:
'GET'

query_string

The query component of the Request-URI, a string of information to be interpreted by the resource. The query portion of a URI follows the path component, and is separated by a '?'. For example, the URI 'http://www.cherrypy.org/wiki?a=3&b=4' has the query component, 'a=3&b=4'.

Value:
''

query_string_encoding

The encoding expected for query string arguments after % HEX HEX decoding). If a query string is provided that cannot be decoded with this encoding, 404 is raised (since technically it's a different URI). If you want arbitrary encodings to not error, set this to 'Latin-1'; you can then encode back to bytes and re-decode to whatever encoding you like later.

Value:
'utf8'

protocol

The HTTP protocol version corresponding to the set of features which should be allowed in the response. If BOTH the client's request message AND the server's level of HTTP compliance is HTTP/1.1, this attribute will be the tuple (1, 1). If either is 1.0, this attribute will be the tuple (1, 0). Lower HTTP protocol versions are not explicitly supported.

Value:
(1, 1)

params

A dict which combines query string (GET) and request entity (POST) variables. This is populated in two stages: GET params are added before the 'on_start_resource' hook, and POST params are added between the 'before_request_body' and 'before_handler' hooks.

Value:
{}

header_list

A list of the HTTP request headers as (name, value) tuples. In general, you should use request.headers (a dict) instead.

Value:
[]

headers

A dict-like object containing the request headers. Keys are header names (in Title-Case format); however, you may get and set them in a case-insensitive manner. That is, headers['Content-Type'] and headers['content-type'] refer to the same value. Values are header values (decoded according to :rfc:`2047` if necessary). See also: httputil.HeaderMap, httputil.HeaderElement.

Value:
{}

rfile

If the request included an entity (body), it will be available as a stream in this attribute. However, the rfile will normally be read for you between the 'before_request_body' hook and the 'before_handler' hook, and the resulting string is placed into either request.params or the request.body attribute.

You may disable the automatic consumption of the rfile by setting request.process_request_body to False, either in config for the desired path, or in an 'on_start_resource' or 'before_request_body' hook.

WARNING: In almost every case, you should not attempt to read from the rfile stream after CherryPy's automatic mechanism has read it. If you turn off the automatic parsing of rfile, you should read exactly the number of bytes specified in request.headers['Content-Length']. Ignoring either of these warnings may result in a hung request thread or in corruption of the next (pipelined) request.

Value:
None

body

If the request Content-Type is 'application/x-www-form-urlencoded' or multipart, this will be None. Otherwise, this will be an instance of :class:`RequestBody<cherrypy._cpreqbody.RequestBody>` (which you can .read()); this value is set between the 'before_request_body' and 'before_handler' hooks (assuming that process_request_body is True).

Value:
None

dispatch

The object which looks up the 'page handler' callable and collects config for the current request based on the path_info, other request attributes, and the application architecture. The core calls the dispatcher as early as possible, passing it a 'path_info' argument.

The default dispatcher discovers the page handler by matching path_info to a hierarchical arrangement of objects, starting at request.app.root. See help(cherrypy.dispatch) for more information.

Value:
cherrypy.dispatch.Dispatcher()

script_name

The 'mount point' of the application which is handling this request.

This attribute MUST NOT end in a slash. If the script_name refers to the root of the URI, it MUST be an empty string (not "/").

Value:
''

path_info

The 'relative path' portion of the Request-URI. This is relative to the script_name ('mount point') of the application which is handling this request.

Value:
'/'

login

When authentication is used during the request processing this is set to 'False' if it failed and to the 'username' value if it succeeded. The default 'None' implies that no authentication happened.

Value:
None

handler

The function, method, or other callable which CherryPy will call to produce the response. The discovery of the handler and the arguments it will receive are determined by the request.dispatch object. By default, the handler is discovered by walking a tree of objects starting at request.app.root, and is then passed all HTTP params (from the query string and POST body) as keyword arguments.

Value:
None

config

A flat dict of all configuration entries which apply to the current request. These entries are collected from global config, application config (based on request.path_info), and from handler config (exactly how is governed by the request.dispatch object in effect for this request; by default, handler config can be attached anywhere in the tree between request.app.root and the final handler, and inherits downward).

Value:
None

is_index

This will be True if the current request is mapped to an 'index' resource handler (also, a 'default' handler if path_info ends with a slash). The value may be used to automatically redirect the user-agent to a 'more canonical' URL which either adds or removes the trailing slash. See cherrypy.tools.trailing_slash.

Value:
None

hooks

A HookMap (dict-like object) of the form: {hookpoint: [hook, ...]}. Each key is a str naming the hook point, and each value is a list of hooks which will be called at that hook point during this request. The list of hooks is generally populated as early as possible (mostly from Tools specified in config), but may be extended at any time. See also: _cprequest.Hook, _cprequest.HookMap, and cherrypy.tools.

Value:
cherrypy._cprequest.HookMap(points=['before_error_response', 'on_end_r\
esource', 'on_end_request', 'before_finalize', 'before_handler', 'afte\
r_error_response', 'on_start_resource', 'before_request_body'])

error_page

A dict of {error code: response filename or callable} pairs.

The error code must be an int representing a given HTTP error code, or the string 'default', which will be used if no matching entry is found for a given numeric code.

If a filename is provided, the file should contain a Python string- formatting template, and can expect by default to receive format values with the mapping keys %(status)s, %(message)s, %(traceback)s, and %(version)s. The set of format mappings can be extended by overriding HTTPError.set_response.

If a callable is provided, it will be called by default with keyword arguments 'status', 'message', 'traceback', and 'version', as for a string-formatting template. The callable must return a string or iterable of strings which will be set to response.body. It may also override headers or perform any other processing.

If no entry is given for an error code, and no 'default' entry exists, a default template will be used.

Value:
{}

throws

The sequence of exceptions which Request.run does not trap.

Value:
(<type 'exceptions.KeyboardInterrupt'>,
 <type 'exceptions.SystemExit'>,
 <class 'cherrypy._cperror.InternalRedirect'>)

stage

A string containing the stage reached in the request-handling process. This is useful when debugging a live server with hung requests.

Value:
None

namespaces

Value:
cherrypy.lib.reprconf.NamespaceSet({'hooks': <function hooks_namespace\
 at 0x9ab94c4>, 'error_page': <function error_page_namespace at 0x9ab9\
7d4>, 'request': <function request_namespace at 0x9ab9764>, 'response'\
: <function response_namespace at 0x9ab979c>, 'tools': <cherrypy._cpto\
ols.Toolbox object at 0x9aaa28c>})

Property Details [hide private]

body_params

If the request Content-Type is 'application/x-www-form-urlencoded' or multipart, this will be a dict of the params pulled from the entity body; that is, it will be the portion of request.params that come from the message body (sometimes called "POST params", although they can be sent with various HTTP method verbs). This value is set between the 'before_request_body' and 'before_handler' hooks (assuming that process_request_body is True).

Deprecated in 3.2, will be removed for 3.3 in favor of :attr:`request.body.params<cherrypy._cprequest.RequestBody.params>`.

Get Method:
_get_body_params(self)