amazon web services - What is the URL header used for in AWS API GET request? -


i looking @ example aws sts api request calls below aws web page 

get / http/1.1 host: sts.amazonaws.com content-type: application/json; charset=utf-8 url: https://sts.amazonaws.com/?durations .......

i can't seem understand if url http header custom header used aws or if new in http (like cors)

either way not find reference header.

can please explain header ? (i.e custom aws or more general)


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