There are sites that will block curl and python-requests completely, but will allow curl-impersonate. IIRC, Amazon is an example that has some bot protection but it isn't "serious".
In most cases this is just based on user agent. It's widespread enough that I just habitually tell requests not to set a User Agent at all (these aren't blocked, but if the UA contains "python" it is).
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There are sites that will block curl and python-requests completely, but will allow curl-impersonate. IIRC, Amazon is an example that has some bot protection but it isn't "serious".
In most cases this is just based on user agent. It's widespread enough that I just habitually tell requests not to set a User Agent at all (these aren't blocked, but if the UA contains "python" it is).