Python httplib 模块，GATEWAY_TIMEOUT 实例源码

def check_resp_status_and_retry(resp, image_id, url):
    # Note(Jesse): This branch sorts errors into those that are permanent,
    # those that are ephemeral, and those that are unexpected.
    if resp.status in (httplib.BAD_REQUEST,                      # 400
                       httplib.UNAUTHORIZED,                     # 401
                       httplib.PAYMENT_REQUIRED,                 # 402
                       httplib.FORBIDDEN,                        # 403
                       httplib.METHOD_NOT_ALLOWED,               # 405
                       httplib.NOT_ACCEPTABLE,                   # 406
                       httplib.PROXY_AUTHENTICATION_REQUIRED,    # 407
                       httplib.CONFLICT,                         # 409
                       httplib.GONE,                             # 410
                       httplib.LENGTH_REQUIRED,                  # 411
                       httplib.PRECONDITION_FAILED,              # 412
                       httplib.REQUEST_ENTITY_TOO_LARGE,         # 413
                       httplib.REQUEST_URI_TOO_LONG,             # 414
                       httplib.UNSUPPORTED_MEDIA_TYPE,           # 415
                       httplib.REQUESTED_RANGE_NOT_SATISFIABLE,  # 416
                       httplib.EXPECTATION_FAILED,               # 417
                       httplib.UNPROCESSABLE_ENTITY,             # 422
                       httplib.LOCKED,                           # 423
                       httplib.FAILED_DEPENDENCY,                # 424
                       httplib.UPGRADE_REQUIRED,                 # 426
                       httplib.NOT_IMPLEMENTED,                  # 501
                       httplib.HTTP_VERSION_NOT_SUPPORTED,       # 505
                       httplib.NOT_EXTENDED,                     # 510
                       ):
        raise PluginError("Got Permanent Error response [%i] while "
                          "uploading image [%s] to glance [%s]"
                          % (resp.status, image_id, url))
    # Nova service would process the exception
    elif resp.status == httplib.NOT_FOUND:                        # 404
        exc = XenAPI.Failure('ImageNotFound')
        raise exc
    # NOTE(nikhil): Only a sub-set of the 500 errors are retryable. We
    # optimistically retry on 500 errors below.
    elif resp.status in (httplib.REQUEST_TIMEOUT,                # 408
                         httplib.INTERNAL_SERVER_ERROR,          # 500
                         httplib.BAD_GATEWAY,                    # 502
                         httplib.SERVICE_UNAVAILABLE,            # 503
                         httplib.GATEWAY_TIMEOUT,                # 504
                         httplib.INSUFFICIENT_STORAGE,           # 507
                         ):
        raise RetryableError("Got Ephemeral Error response [%i] while "
                             "uploading image [%s] to glance [%s]"
                             % (resp.status, image_id, url))
    else:
        # Note(Jesse): Assume unexpected errors are retryable. If you are
        # seeing this error message, the error should probably be added
        # to either the ephemeral or permanent error list.
        raise RetryableError("Got Unexpected Error response [%i] while "
                             "uploading image [%s] to glance [%s]"
                             % (resp.status, image_id, url))