python类url()的实例源码

def get_handlers(self):
        urls = [
            url("/typecheck/(.*)", TypeCheckHandler, name='typecheck'),
            url("/decode_arg/(.*)", DecodeArgHandler, name='decode_arg'),
            url("/decode_arg_kw/(?P<arg>.*)", DecodeArgHandler),
            url("/linkify", LinkifyHandler),
            url("/uimodule_resources", UIModuleResourceHandler),
            url("/optional_path/(.+)?", OptionalPathHandler),
            url("/multi_header", MultiHeaderHandler),
            url("/redirect", RedirectHandler),
            url("/web_redirect_permanent", WebRedirectHandler, {"url": "/web_redirect_newpath"}),
            url("/web_redirect", WebRedirectHandler, {"url": "/web_redirect_newpath", "permanent": False}),
            url("//web_redirect_double_slash", WebRedirectHandler, {"url": '/web_redirect_newpath'}),
            url("/header_injection", HeaderInjectionHandler),
            url("/get_argument", GetArgumentHandler),
            url("/get_arguments", GetArgumentsHandler),
        ]
        return urls

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
            url("/no_content_length", NoContentLengthHandler),
            url("/echo_post", EchoPostHandler),
            url("/respond_in_prepare", RespondInPrepareHandler),
            url("/redirect", RedirectHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            [sock] = bind_sockets(None, '::1', family=socket.AF_INET6)
            port = sock.getsockname()[1]
            self.http_server.add_socket(sock)
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = '%s://[::1]:%d/hello' % (self.get_protocol(), port)

        # ipv6 is currently enabled by default but can be disabled
        self.http_client.fetch(url, self.stop, allow_ipv6=False)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def get_handlers(self):
        urls = [
            url("/typecheck/(.*)", TypeCheckHandler, name='typecheck'),
            url("/decode_arg/(.*)", DecodeArgHandler, name='decode_arg'),
            url("/decode_arg_kw/(?P<arg>.*)", DecodeArgHandler),
            url("/linkify", LinkifyHandler),
            url("/uimodule_resources", UIModuleResourceHandler),
            url("/optional_path/(.+)?", OptionalPathHandler),
            url("/multi_header", MultiHeaderHandler),
            url("/redirect", RedirectHandler),
            url("/web_redirect_permanent", WebRedirectHandler, {"url": "/web_redirect_newpath"}),
            url("/web_redirect", WebRedirectHandler, {"url": "/web_redirect_newpath", "permanent": False}),
            url("//web_redirect_double_slash", WebRedirectHandler, {"url": '/web_redirect_newpath'}),
            url("/header_injection", HeaderInjectionHandler),
            url("/get_argument", GetArgumentHandler),
            url("/get_arguments", GetArgumentsHandler),
        ]
        return urls

def test_streaming_follow_redirects(self):
        # When following redirects, header and streaming callbacks
        # should only be called for the final result.
        # TODO(bdarnell): this test belongs in httpclient_test instead of
        # simple_httpclient_test, but it fails with the version of libcurl
        # available on travis-ci. Move it when that has been upgraded
        # or we have a better framework to skip tests based on curl version.
        headers = []
        chunks = []
        self.fetch("/redirect?url=/hello",
                   header_callback=headers.append,
                   streaming_callback=chunks.append)
        chunks = list(map(to_unicode, chunks))
        self.assertEqual(chunks, ['Hello world!'])
        # Make sure we only got one set of headers.
        num_start_lines = len([h for h in headers if h.startswith("HTTP/")])
        self.assertEqual(num_start_lines, 1)

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
            url("/no_content_length", NoContentLengthHandler),
            url("/echo_post", EchoPostHandler),
            url("/respond_in_prepare", RespondInPrepareHandler),
            url("/redirect", RedirectHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            [sock] = bind_sockets(None, '::1', family=socket.AF_INET6)
            port = sock.getsockname()[1]
            self.http_server.add_socket(sock)
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = '%s://[::1]:%d/hello' % (self.get_protocol(), port)

        # ipv6 is currently enabled by default but can be disabled
        self.http_client.fetch(url, self.stop, allow_ipv6=False)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def test_streaming_follow_redirects(self):
        # When following redirects, header and streaming callbacks
        # should only be called for the final result.
        # TODO(bdarnell): this test belongs in httpclient_test instead of
        # simple_httpclient_test, but it fails with the version of libcurl
        # available on travis-ci. Move it when that has been upgraded
        # or we have a better framework to skip tests based on curl version.
        headers = []
        chunks = []
        self.fetch("/redirect?url=/hello",
                   header_callback=headers.append,
                   streaming_callback=chunks.append)
        chunks = list(map(to_unicode, chunks))
        self.assertEqual(chunks, ['Hello world!'])
        # Make sure we only got one set of headers.
        num_start_lines = len([h for h in headers if h.startswith("HTTP/")])
        self.assertEqual(num_start_lines, 1)

def get_handlers(self):
        urls = [
            url("/typecheck/(.*)", TypeCheckHandler, name='typecheck'),
            url("/decode_arg/(.*)", DecodeArgHandler, name='decode_arg'),
            url("/decode_arg_kw/(?P<arg>.*)", DecodeArgHandler),
            url("/linkify", LinkifyHandler),
            url("/uimodule_resources", UIModuleResourceHandler),
            url("/optional_path/(.+)?", OptionalPathHandler),
            url("/multi_header", MultiHeaderHandler),
            url("/redirect", RedirectHandler),
            url("/web_redirect_permanent", WebRedirectHandler, {"url": "/web_redirect_newpath"}),
            url("/web_redirect", WebRedirectHandler, {"url": "/web_redirect_newpath", "permanent": False}),
            url("//web_redirect_double_slash", WebRedirectHandler, {"url": '/web_redirect_newpath'}),
            url("/header_injection", HeaderInjectionHandler),
            url("/get_argument", GetArgumentHandler),
            url("/get_arguments", GetArgumentsHandler),
        ]
        return urls

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
            url("/no_content_length", NoContentLengthHandler),
            url("/echo_post", EchoPostHandler),
            url("/respond_in_prepare", RespondInPrepareHandler),
            url("/redirect", RedirectHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            [sock] = bind_sockets(None, '::1', family=socket.AF_INET6)
            port = sock.getsockname()[1]
            self.http_server.add_socket(sock)
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = '%s://[::1]:%d/hello' % (self.get_protocol(), port)

        # ipv6 is currently enabled by default but can be disabled
        self.http_client.fetch(url, self.stop, allow_ipv6=False)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def test_decode_argument(self):
        # These urls all decode to the same thing
        urls = ["/decode_arg/%C3%A9?foo=%C3%A9&encoding=utf-8",
                "/decode_arg/%E9?foo=%E9&encoding=latin1",
                "/decode_arg_kw/%E9?foo=%E9&encoding=latin1",
                ]
        for url in urls:
            response = self.fetch(url)
            response.rethrow()
            data = json_decode(response.body)
            self.assertEqual(data, {u'path': [u'unicode', u'\u00e9'],
                                    u'query': [u'unicode', u'\u00e9'],
                                    })

        response = self.fetch("/decode_arg/%C3%A9?foo=%C3%A9")
        response.rethrow()
        data = json_decode(response.body)
        self.assertEqual(data, {u'path': [u'bytes', u'c3a9'],
                                u'query': [u'bytes', u'c3a9'],
                                })

def test_ipv6(self):
        if not socket.has_ipv6:
            # python compiled without ipv6 support, so skip this test
            return
        try:
            self.http_server.listen(self.get_http_port(), address='::1')
        except socket.gaierror, e:
            if e.errno == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = self.get_url("/hello").replace("localhost", "[::1]")

        # ipv6 is currently disabled by default and must be explicitly requested
        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop, allow_ipv6=True)
        response = self.wait()
        self.assertEqual(response.body, b("Hello world!"))

def test_decode_argument(self):
        # These urls all decode to the same thing
        urls = ["/decode_arg/%C3%A9?foo=%C3%A9&encoding=utf-8",
                "/decode_arg/%E9?foo=%E9&encoding=latin1",
                "/decode_arg_kw/%E9?foo=%E9&encoding=latin1",
                ]
        for url in urls:
            response = self.fetch(url)
            response.rethrow()
            data = json_decode(response.body)
            self.assertEqual(data, {u('path'): [u('unicode'), u('\u00e9')],
                                    u('query'): [u('unicode'), u('\u00e9')],
                                    })

        response = self.fetch("/decode_arg/%C3%A9?foo=%C3%A9")
        response.rethrow()
        data = json_decode(response.body)
        self.assertEqual(data, {u('path'): [u('bytes'), u('c3a9')],
                                u('query'): [u('bytes'), u('c3a9')],
                                })

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            self.http_server.listen(self.get_http_port(), address='::1')
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = self.get_url("/hello").replace("localhost", "[::1]")

        # ipv6 is currently disabled by default and must be explicitly requested
        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop, allow_ipv6=True)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
            url("/no_content_length", NoContentLengthHandler),
            url("/echo_post", EchoPostHandler),
            url("/respond_in_prepare", RespondInPrepareHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            [sock] = bind_sockets(None, '::1', family=socket.AF_INET6)
            port = sock.getsockname()[1]
            self.http_server.add_socket(sock)
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = '%s://[::1]:%d/hello' % (self.get_protocol(), port)

        # ipv6 is currently enabled by default but can be disabled
        self.http_client.fetch(url, self.stop, allow_ipv6=False)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
            url("/no_content_length", NoContentLengthHandler),
            url("/echo_post", EchoPostHandler),
            url("/respond_in_prepare", RespondInPrepareHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            [sock] = bind_sockets(None, '::1', family=socket.AF_INET6)
            port = sock.getsockname()[1]
            self.http_server.add_socket(sock)
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = '%s://[::1]:%d/hello' % (self.get_protocol(), port)

        # ipv6 is currently enabled by default but can be disabled
        self.http_client.fetch(url, self.stop, allow_ipv6=False)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def test_decode_argument(self):
        # These urls all decode to the same thing
        urls = ["/decode_arg/%C3%A9?foo=%C3%A9&encoding=utf-8",
                "/decode_arg/%E9?foo=%E9&encoding=latin1",
                "/decode_arg_kw/%E9?foo=%E9&encoding=latin1",
                ]
        for url in urls:
            response = self.fetch(url)
            response.rethrow()
            data = json_decode(response.body)
            self.assertEqual(data, {u'path': [u'unicode', u'\u00e9'],
                                    u'query': [u'unicode', u'\u00e9'],
                                    })

        response = self.fetch("/decode_arg/%C3%A9?foo=%C3%A9")
        response.rethrow()
        data = json_decode(response.body)
        self.assertEqual(data, {u'path': [u'bytes', u'c3a9'],
                                u'query': [u'bytes', u'c3a9'],
                                })

def test_ipv6(self):
        try:
            self.http_server.listen(self.get_http_port(), address='::1')
        except socket.gaierror, e:
            if e.errno == socket.EAI_ADDRFAMILY:
                # ipv6 is not configured on this system, so skip this test
                return
            raise
        url = self.get_url("/hello").replace("localhost", "[::1]")

        # ipv6 is currently disabled by default and must be explicitly requested
        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop, allow_ipv6=True)
        response = self.wait()
        self.assertEqual(response.body, b("Hello world!"))

def test_decode_argument(self):
        # These urls all decode to the same thing
        urls = ["/decode_arg/%C3%A9?foo=%C3%A9&encoding=utf-8",
                "/decode_arg/%E9?foo=%E9&encoding=latin1",
                "/decode_arg_kw/%E9?foo=%E9&encoding=latin1",
                ]
        for url in urls:
            response = self.fetch(url)
            response.rethrow()
            data = json_decode(response.body)
            self.assertEqual(data, {u('path'): [u('unicode'), u('\u00e9')],
                                    u('query'): [u('unicode'), u('\u00e9')],
                                    })

        response = self.fetch("/decode_arg/%C3%A9?foo=%C3%A9")
        response.rethrow()
        data = json_decode(response.body)
        self.assertEqual(data, {u('path'): [u('bytes'), u('c3a9')],
                                u('query'): [u('bytes'), u('c3a9')],
                                })

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            self.http_server.listen(self.get_http_port(), address='::1')
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = self.get_url("/hello").replace("localhost", "[::1]")

        # ipv6 is currently disabled by default and must be explicitly requested
        with ExpectLog(gen_log, "uncaught exception"):
            self.http_client.fetch(url, self.stop)
            response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop, allow_ipv6=True)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def get_handlers(self):
        urls = [
            url("/typecheck/(.*)", TypeCheckHandler, name='typecheck'),
            url("/decode_arg/(.*)", DecodeArgHandler, name='decode_arg'),
            url("/decode_arg_kw/(?P<arg>.*)", DecodeArgHandler),
            url("/linkify", LinkifyHandler),
            url("/uimodule_resources", UIModuleResourceHandler),
            url("/optional_path/(.+)?", OptionalPathHandler),
            url("/multi_header", MultiHeaderHandler),
            url("/redirect", RedirectHandler),
            url("/web_redirect_permanent", WebRedirectHandler, {"url": "/web_redirect_newpath"}),
            url("/web_redirect", WebRedirectHandler, {"url": "/web_redirect_newpath", "permanent": False}),
            url("//web_redirect_double_slash", WebRedirectHandler, {"url": '/web_redirect_newpath'}),
            url("/header_injection", HeaderInjectionHandler),
            url("/get_argument", GetArgumentHandler),
            url("/get_arguments", GetArgumentsHandler),
        ]
        return urls

def get_app(self):
        # callable objects to finish pending /trigger requests
        self.triggers = collections.deque()
        return Application([
            url("/trigger", TriggerHandler, dict(queue=self.triggers,
                                                 wake_callback=self.stop)),
            url("/chunk", ChunkHandler),
            url("/countdown/([0-9]+)", CountdownHandler, name="countdown"),
            url("/hang", HangHandler),
            url("/hello", HelloWorldHandler),
            url("/content_length", ContentLengthHandler),
            url("/head", HeadHandler),
            url("/options", OptionsHandler),
            url("/no_content", NoContentHandler),
            url("/see_other_post", SeeOtherPostHandler),
            url("/see_other_get", SeeOtherGetHandler),
            url("/host_echo", HostEchoHandler),
            url("/no_content_length", NoContentLengthHandler),
            url("/echo_post", EchoPostHandler),
            url("/respond_in_prepare", RespondInPrepareHandler),
            url("/redirect", RedirectHandler),
        ], gzip=True)

def test_ipv6(self):
        try:
            [sock] = bind_sockets(None, '::1', family=socket.AF_INET6)
            port = sock.getsockname()[1]
            self.http_server.add_socket(sock)
        except socket.gaierror as e:
            if e.args[0] == socket.EAI_ADDRFAMILY:
                # python supports ipv6, but it's not configured on the network
                # interface, so skip this test.
                return
            raise
        url = '%s://[::1]:%d/hello' % (self.get_protocol(), port)

        # ipv6 is currently enabled by default but can be disabled
        self.http_client.fetch(url, self.stop, allow_ipv6=False)
        response = self.wait()
        self.assertEqual(response.code, 599)

        self.http_client.fetch(url, self.stop)
        response = self.wait()
        self.assertEqual(response.body, b"Hello world!")

def get_handlers(self):
        urls = [
            url("/typecheck/(.*)", TypeCheckHandler, name='typecheck'),
            url("/decode_arg/(.*)", DecodeArgHandler, name='decode_arg'),
            url("/decode_arg_kw/(?P<arg>.*)", DecodeArgHandler),
            url("/linkify", LinkifyHandler),
            url("/uimodule_resources", UIModuleResourceHandler),
            url("/optional_path/(.+)?", OptionalPathHandler),
            url("/multi_header", MultiHeaderHandler),
            url("/redirect", RedirectHandler),
            url("/web_redirect_permanent", WebRedirectHandler, {"url": "/web_redirect_newpath"}),
            url("/web_redirect", WebRedirectHandler, {"url": "/web_redirect_newpath", "permanent": False}),
            url("//web_redirect_double_slash", WebRedirectHandler, {"url": '/web_redirect_newpath'}),
            url("/header_injection", HeaderInjectionHandler),
            url("/get_argument", GetArgumentHandler),
            url("/get_arguments", GetArgumentsHandler),
        ]
        return urls

def test_non_reversible(self):
        # URLSpecs are non-reversible if they include non-constant
        # regex features outside capturing groups. Currently, this is
        # only strictly enforced for backslash-escaped character
        # classes.
        paths = [
            r'^/api/v\d+/foo/(\w+)$',
        ]
        for path in paths:
            # A URLSpec can still be created even if it cannot be reversed.
            url_spec = url(path, None)
            try:
                result = url_spec.reverse()
                self.fail("did not get expected exception when reversing %s. "
                          "result: %s" % (path, result))
            except ValueError:
                pass