René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Transcoding Error Improvements","articleBody":"https://github.com/googleapis/python-api-core/blob/fe617c205918a3e4dfddeb06123e70540898032e/google/api_core/path_template.py#L319-L322\r\n\r\nThe transcoding error above should be improved to provide more helpful information when there is a transcoding issue. For example, given the code below which is missing the `instance_group` parameter, the error message should say something along the lines of `missing required parameter instance_group` instead of the cryptic error `Request {} does not match any URL path template in available HttpRule's ['/compute/v1/projects/{project}/zones/{zone}/instanceGroups/{instance_group}/listInstances']`. In addition, it's not desirable to echo the parameters in the error message.\r\n\r\n```\r\nfrom google.cloud import compute_v1\r\n\r\nproject = \"project-XXX\"\r\nzone = \"us-central1-a\"\r\n\r\ninstance_groups_list_instances_request_resource = compute_v1.InstanceGroupsListInstancesRequest()\r\ninstance_groups_list_instances_request_resource.instance_state = \"RUNNING\"\r\ninstance_groups_client = compute_v1.InstanceGroupsClient()\r\n\r\ninstance_groups_list = instance_groups_client.list_instances(project=project, zone=zone,  instance_groups_list_instances_request_resource=instance_groups_list_instances_request_resource)\r\n\r\nfor instance in instance_groups_list:\r\n    print(instance.name, instance.labels)\r\n```\r\n","author":{"url":"https://github.com/parthea","@type":"Person","name":"parthea"},"datePublished":"2022-09-13T21:08:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/441/python-api-core/issues/441"}