11.4.3 BaseHandler Objects

BaseHandler objects provide a couple of methods that are directly useful, and others that are meant to be used by derived classes. These are intended for direct use:

add_parent(director): Add a director as parent.

close(): Remove any parents.

The following members and methods should be used only be classes derived from BaseHandler:

parent: A valid OpenerDirector, which can be used to open using a different protocol, or handle errors.

default_open(req)

This method is not defined in BaseHandler, but subclasses should define it if they want to catch all URLs.

This method, if exists, will be called by the parent OpenerDirector. It should return a file-like object as described in the return value of the open() of OpenerDirector or None. It should raise URLError, unless a truly exceptional thing happens (for example, MemoryError should not be mapped to URLError.

This method will be called before any protocol-specific open method.

protocol_open(req): This method is not defined in BaseHandler, but subclasses should define it if they want to handle URLs with the given protocol.
This method, if defined, will be called by the parent OpenerDirector. Return values should be the same as for default_open().

unknown_open(req): This method is not defined in BaseHandler, but subclasses should define it if they want to catch all URLs with no specific registerd handler to open it.
This method, if exists, will be called by the parent OpenerDirector. Return values should be the same as for default_open().

http_error_default(req, fp, code, msg, hdrs)

This method is not defined in BaseHandler, but subclasses should override it if they intend to provide a catch-all for otherwise unhandled HTTP errors. It will be called automatically by the OpenerDirector getting the error, and should not normally be called in other circumstances.

req will be a Request object, fp will be a file-like object with the HTTP error body, code will be the three-digit code of the error, msg will be the user-visible explanation of the code and hdrs will be a mapping object with the headers of the error.

Return values and exceptions raised should be the same as those of urlopen().

http_error_nnn(req, fp, code, msg, hdrs)

nnn should be a three-digit HTTP error code. This method is also not defined in BaseHandler, but will be called, if it exists, on an instance of a subclass, when an HTTP error with code nnn occurs.

Subclasses should override this method to handle specific HTTP errors.

Arguments, return values and exceptions raised should be the same as for http_error_default().

See About this document... for information on suggesting changes.

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