Even if you built a service that implements this API, I don't see much use
for that. Somebody needs to connect to you with HTTP to get what? HTTP
headers?
Yes. One use case is to find the package name of an Android app, which is returned from an AndroidWebview in the "x-requested-with" header. This could enable you to show a banner to Android users only or even do simple A/B testing.
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[ 1.5 ms ] story [ 21.5 ms ] threadhttps://httpbin.org/headers