HTTP Header Issues - Mock API

Is anyone else facing issues with submitting their X-API-Key as http request header?

i always receive the following error
{“error”:“API Key required. Please make sure to specify ?key=(your api key) in the url or add an X-API-Key http request header.”}

Not that issue - but I am getting this issue when calling api’s: {“error”:“Your handler script took too long to execute. The handler script must execute in under 30 seconds”}