class PreconditionRequired(HTTPException):
428 Precondition Required
The server requires this request to be conditional, typically to prevent the lost update problem, which is a race condition between two or more clients attempting to update a resource through PUT or DELETE. By requiring each client to include a conditional header ("If-Match" or "If-Unmodified- Since") with the proper value retained from a recent GET request, the server ensures that each client has at least seen the previous revision of the resource.
| Class Variable | code |
Undocumented |
| Class Variable | description |
Undocumented |
Inherited from HTTPException:
| Class Method | wrap |
Create an exception that is a subclass of the calling HTTP exception and the exception argument. |
| Method | __call__ |
Call the exception as WSGI application. |
| Method | __init__ |
Undocumented |
| Method | __repr__ |
Undocumented |
| Method | __str__ |
Undocumented |
| Method | get_body |
Get the HTML body. |
| Method | get_description |
Get the description. |
| Method | get_headers |
Get a list of headers. |
| Method | get_response |
Get a response object. If one was passed to the exception it's returned directly. |
| Instance Variable | response |
Undocumented |
| Property | name |
The status name. |