RequestSizeLimitMiddleware not working with only global size limits

[PatrickTaibel]

Branch/Environment/Version

• Branch/Version: master
• Environment: On-prem

Describe the bug RequestSizeLimitMiddleware does not work when only setting the global size limits on APIs. The activation detection (EnabledForSpec) does only care about the configuration in extended_paths.

Reproduction steps Steps to reproduce the behavior:

1. Add any API using the global_size_limit without specify any size_limits in extended_paths
2. Make a request that exceeds the configured limit

Actual behavior RequestSizeLimitMiddleware gets not activated when setting global_size_limit. Therefore, no limit gets applied.

Expected behavior The specified limit is applied to the incoming requests.

Additional context Check for global_size_limit is missing: https://github.com/TykTechnologies/tyk/blob/1d0190d987cde6de13b50e75ab413262aa628b24/gateway/mw_request_size_limit.go#L23-L30