Top 5 issues with web services

Top 5 issues with web services that might arise during development, deployment, or usage lately:

1. Connectivity Problems: Difficulty in establishing a connection between the client and the web service due to network issues, firewall restrictions, or incorrect endpoint URLs.
2. Authentication and Authorization: Issues with authentication mechanisms or incorrect authorization credentials, leading to access denied errors.
3. Service Unavailability: The web service might be down or experiencing downtime, leading to service unavailable errors. The incorrect use of lambdas for a potential slow processes, not detected in pre-production environments.
4. Data Format Mismatch: Problems with data serialization and deserialization due to mismatched formats between the client and the service, leading to errors in data transmission or reception. Sometimes because critical input fields are allowed to be filled in by human typing.
5. Performance Bottlenecks: Slow response times or timeouts caused by inefficient coding, heavy server load, or inadequate resources allocated to the service.