How to obtain the header information of the request page

How can I get the header information of the request page and the headers of the request page? Does the environment use & nbsp; does nginx get the URL & nbsp; of the previous page through get_headers (url); or is there a convenient function that can directly obtain headers information? Obtain the header information of the request page.
How do I obtain the headers of the request page?
Use nginx in environment
Whether to use get_headers (URL); to obtain the url of the previous page
Is there a convenient function that can directly obtain headers information?

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Isn't curl okay?
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They thought they were owls like you.
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You are inspired by the awakening.