# 21.11. `http` — HTTP modules

Source code: Lib/http/__init__.py

`http` is a package that collects several modules for working with the HyperText Transfer Protocol:

- `http.client` is a low-level HTTP protocol client; for high-level URL opening use `urllib.request`

- `http.server` contains basic HTTP server classes based on `socketserver`

- `http.cookies` has utilities for implementing state management with cookies

- `http.cookiejar` provides persistence of cookies

`http` is also a module that defines a number of HTTP status codes and associated messages through the `http.HTTPStatus` enum:

class `http.``HTTPStatus`

  New in version 3.5.

  A subclass of `enum.IntEnum` that defines a set of HTTP status codes, reason phrases and long descriptions written in English.

  Usage:

      >>> from http import HTTPStatus
      >>> HTTPStatus.OK
      <HTTPStatus.OK: 200>
      >>> HTTPStatus.OK == 200
      True
      >>> http.HTTPStatus.OK.value
      200
      >>> HTTPStatus.OK.phrase
      'OK'
      >>> HTTPStatus.OK.description
      'Request fulfilled, document follows'
      >>> list(HTTPStatus)
      [<HTTPStatus.CONTINUE: 100>, <HTTPStatus.SWITCHING_PROTOCOLS: 101>, ...]

## 21.11.1. HTTP status codes

Supported, IANA-registered status codes available in `http.HTTPStatus` are:

Code | Enum Name | Details
--- | --- | ---
`100` | `CONTINUE` | HTTP/1.1 RFC 7231, Section 6.2.1
`101` | `SWITCHING_PROTOCOLS` | HTTP/1.1 RFC 7231, Section 6.2.2
`102` | `PROCESSING` | WebDAV RFC 2518, Section 10.1
`200` | `OK` | HTTP/1.1 RFC 7231, Section 6.3.1
`201` | `CREATED` | HTTP/1.1 RFC 7231, Section 6.3.2
`202` | `ACCEPTED` | HTTP/1.1 RFC 7231, Section 6.3.3
`203` | `NON_AUTHORITATIVE_INFORMATION` | HTTP/1.1 RFC 7231, Section 6.3.4
`204` | `NO_CONTENT` | HTTP/1.1 RFC 7231, Section 6.3.5
`205` | `RESET_CONTENT` | HTTP/1.1 RFC 7231, Section 6.3.6
`206` | `PARTIAL_CONTENT` | HTTP/1.1 RFC 7233, Section 4.1
`207` | `MULTI_STATUS` | WebDAV RFC 4918, Section 11.1
`208` | `ALREADY_REPORTED` | WebDAV Binding Extensions RFC 5842, Section 7.1 (Experimental)
`226` | `IM_USED` | Delta Encoding in HTTP RFC 3229, Section 10.4.1
`300` | `MULTIPLE_CHOICES` | HTTP/1.1 RFC 7231, Section 6.4.1
`301` | `MOVED_PERMANENTLY` | HTTP/1.1 RFC 7231, Section 6.4.2
`302` | `FOUND` | HTTP/1.1 RFC 7231, Section 6.4.3
`303` | `SEE_OTHER` | HTTP/1.1 RFC 7231, Section 6.4.4
`304` | `NOT_MODIFIED` | HTTP/1.1 RFC 7232, Section 4.1
`305` | `USE_PROXY` | HTTP/1.1 RFC 7231, Section 6.4.5
`307` | `TEMPORARY_REDIRECT` | HTTP/1.1 RFC 7231, Section 6.4.7
`308` | `PERMANENT_REDIRECT` | Permanent Redirect RFC 7238, Section 3 (Experimental)
`400` | `BAD_REQUEST` | HTTP/1.1 RFC 7231, Section 6.5.1
`401` | `UNAUTHORIZED` | HTTP/1.1 Authentication RFC 7235, Section 3.1
`402` | `PAYMENT_REQUIRED` | HTTP/1.1 RFC 7231, Section 6.5.2
`403` | `FORBIDDEN` | HTTP/1.1 RFC 7231, Section 6.5.3
`404` | `NOT_FOUND` | HTTP/1.1 RFC 7231, Section 6.5.4
`405` | `METHOD_NOT_ALLOWED` | HTTP/1.1 RFC 7231, Section 6.5.5
`406` | `NOT_ACCEPTABLE` | HTTP/1.1 RFC 7231, Section 6.5.6
`407` | `PROXY_AUTHENTICATION_REQUIRED` | HTTP/1.1 Authentication RFC 7235, Section 3.2
`408` | `REQUEST_TIMEOUT` | HTTP/1.1 RFC 7231, Section 6.5.7
`409` | `CONFLICT` | HTTP/1.1 RFC 7231, Section 6.5.8
`410` | `GONE` | HTTP/1.1 RFC 7231, Section 6.5.9
`411` | `LENGTH_REQUIRED` | HTTP/1.1 RFC 7231, Section 6.5.10
`412` | `PRECONDITION_FAILED` | HTTP/1.1 RFC 7232, Section 4.2
`413` | `REQUEST_ENTITY_TOO_LARGE` | HTTP/1.1 RFC 7231, Section 6.5.11
`414` | `REQUEST_URI_TOO_LONG` | HTTP/1.1 RFC 7231, Section 6.5.12
`415` | `UNSUPPORTED_MEDIA_TYPE` | HTTP/1.1 RFC 7231, Section 6.5.13
`416` | `REQUEST_RANGE_NOT_SATISFIABLE` | HTTP/1.1 Range Requests RFC 7233, Section 4.4
`417` | `EXPECTATION_FAILED` | HTTP/1.1 RFC 7231, Section 6.5.14
`422` | `UNPROCESSABLE_ENTITY` | WebDAV RFC 4918, Section 11.2
`423` | `LOCKED` | WebDAV RFC 4918, Section 11.3
`424` | `FAILED_DEPENDENCY` | WebDAV RFC 4918, Section 11.4
`426` | `UPGRADE_REQUIRED` | HTTP/1.1 RFC 7231, Section 6.5.15
`428` | `PRECONDITION_REQUIRED` | Additional HTTP Status Codes RFC 6585
`429` | `TOO_MANY_REQUESTS` | Additional HTTP Status Codes RFC 6585
`431` | `REQUEST_HEADER_FIELDS_TOO_LARGE` | Additional HTTP Status Codes RFC 6585
`500` | `INTERNAL_SERVER_ERROR` | HTTP/1.1 RFC 7231, Section 6.6.1
`501` | `NOT_IMPLEMENTED` | HTTP/1.1 RFC 7231, Section 6.6.2
`502` | `BAD_GATEWAY` | HTTP/1.1 RFC 7231, Section 6.6.3
`503` | `SERVICE_UNAVAILABLE` | HTTP/1.1 RFC 7231, Section 6.6.4
`504` | `GATEWAY_TIMEOUT` | HTTP/1.1 RFC 7231, Section 6.6.5
`505` | `HTTP_VERSION_NOT_SUPPORTED` | HTTP/1.1 RFC 7231, Section 6.6.6
`506` | `VARIANT_ALSO_NEGOTIATES` | Transparent Content Negotiation in HTTP RFC 2295, Section 8.1 (Experimental)
`507` | `INSUFFICIENT_STORAGE` | WebDAV RFC 4918, Section 11.5
`508` | `LOOP_DETECTED` | WebDAV Binding Extensions RFC 5842, Section 7.2 (Experimental)
`510` | `NOT_EXTENDED` | An HTTP Extension Framework RFC 2774, Section 7 (Experimental)
`511` | `NETWORK_AUTHENTICATION_REQUIRED` | Additional HTTP Status Codes RFC 6585, Section 6

In order to preserve backwards compatibility, enum values are also present in the `http.client` module in the form of constants. The enum name is equal to the constant name (i.e. `http.HTTPStatus.OK` is also available as `http.client.OK`).