httpstatuses/contents/codes/412.md

---
set: 4
code: 412
title: Precondition Failed
references:
    "Rails HTTP Status Symbol": ":precondition_failed"
    "Go HTTP Status Constant": "http.StatusPreconditionFailed"
    "Symfony HTTP Status Constant": "Response::HTTP_PRECONDITION_FAILED"
    "Python2 HTTP Status Constant": "httplib.PRECONDITION_FAILED"
    "Python3+ HTTP Status Constant": "http.client.PRECONDITION_FAILED"
    "Python3.5+ HTTP Status Constant": "http.HTTPStatus.PRECONDITION_FAILED"
---

One or more conditions given in the request header fields evaluated to false when tested on the server.

This response code allows the client to place preconditions on the current resource state (its current representations and metadata) and, thus, prevent the request method from being applied if the target resource is in an unexpected state.

---

* Source: [RFC7232 Section 4.2][1]

[1]: <http://tools.ietf.org/html/rfc7232#section-4.2>
Adds placeholder codes for development 2015-11-06 21:39:33 +01:00			`---`
			`set: 4`
			`code: 412`
			`title: Precondition Failed`
Adds 4xx Client Error class status codes descriptions from latest standards 2015-11-07 05:34:40 +01:00			`references:`
			`"Rails HTTP Status Symbol": ":precondition_failed"`
Add Go status constants 2016-01-27 23:08:33 +01:00			`"Go HTTP Status Constant": "http.StatusPreconditionFailed"`
Add Symfony HTTP Status Constant references (#48) 2016-04-19 15:19:17 +02:00			`"Symfony HTTP Status Constant": "Response::HTTP_PRECONDITION_FAILED"`
Add Python status constants (#57) * Add Python status constants * Add Python 2, Python 3+, Python 3.5+ status constants 2016-05-22 01:07:17 +02:00			`"Python2 HTTP Status Constant": "httplib.PRECONDITION_FAILED"`
			`"Python3+ HTTP Status Constant": "http.client.PRECONDITION_FAILED"`
			`"Python3.5+ HTTP Status Constant": "http.HTTPStatus.PRECONDITION_FAILED"`
Adds placeholder codes for development 2015-11-06 21:39:33 +01:00			`---`

Remove markdown line limit (#52) * Removes line length limit from Status Code Markdown This will make the data easier to use when we develop the API, it needs to be consistent, arbitrary new lines (especially in text format) will be a major issue, so some sort of workaround would have to be implemented, easier to simply fix the source files. * Removes line length limit from misc. Markdown files 2016-04-23 02:12:07 +02:00			`One or more conditions given in the request header fields evaluated to false when tested on the server.`
Gives 4xx codes simple opening paragraphs 2015-11-07 06:45:46 +01:00
Remove markdown line limit (#52) * Removes line length limit from Status Code Markdown This will make the data easier to use when we develop the API, it needs to be consistent, arbitrary new lines (especially in text format) will be a major issue, so some sort of workaround would have to be implemented, easier to simply fix the source files. * Removes line length limit from misc. Markdown files 2016-04-23 02:12:07 +02:00			`This response code allows the client to place preconditions on the current resource state (its current representations and metadata) and, thus, prevent the request method from being applied if the target resource is in an unexpected state.`
Adds 4xx Client Error class status codes descriptions from latest standards 2015-11-07 05:34:40 +01:00
Improves 4xx class status codes with referencing 2015-11-09 02:44:05 +01:00			`---`

			`* Source: [RFC7232 Section 4.2][1]`
Adds 4xx Client Error class status codes descriptions from latest standards 2015-11-07 05:34:40 +01:00
Add Go status constants 2016-01-27 23:08:33 +01:00			`[1]: <http://tools.ietf.org/html/rfc7232#section-4.2>`