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| def add_url_rule(self, rule, endpoint=None, view_func=None,
provide_automatic_options=None, **options):
# endpoint 默认使用的是函数名
if endpoint is None:
endpoint = _endpoint_from_view_func(view_func)
options['endpoint'] = endpoint
# 提供 HTTP 方法
# 1) methods 参数 2) 从 view_func 的 methods 属性 3) view_func 的 require_methods 属性
# 如果这两个都没提供, 则默认只支持 GET
methods = options.pop('methods', None)
if methods is None:
methods = getattr(view_func, 'methods', None) or ('GET',)
if isinstance(methods, string_types):
raise TypeError('Allowed methods have to be iterables of strings, '
'for example: @app.route(..., methods=["POST"])')
methods = set(item.upper() for item in methods)
# Methods that should always be added
required_methods = set(getattr(view_func, 'required_methods', ()))
# provide_automatic_options 为非 None 时不会自动提供 OPTIONS 方法
if provide_automatic_options is None:
provide_automatic_options = getattr(view_func,
'provide_automatic_options', None)
if provide_automatic_options is None:
if 'OPTIONS' not in methods:
provide_automatic_options = True
required_methods.add('OPTIONS')
else:
provide_automatic_options = False
# Add the required methods now.
methods |= required_methods
rule = self.url_rule_class(rule, methods=methods, **options)
rule.provide_automatic_options = provide_automatic_options
self.url_map.add(rule)
if view_func is not None:
old_func = self.view_functions.get(endpoint)
if old_func is not None and old_func != view_func:
raise AssertionError('View function mapping is overwriting an '
'existing endpoint function: %s' % endpoint)
self.view_functions[endpoint] = view_func
|