Blank full-text extraction

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While parsing some sites I receive “[unable to retrieve full-text content]” message.
I have debugged the script and on the extraction section $response->body contains message “You look like a bot, go away.”
Thus, the server recognizes the script as a bot. I tried to use a proxy and set various values of http_header(user-agent): in config files without any result.
Can you help me to solve the issue? Sites are critical for my project :frowning:
Thanks a lot for a fast reply.

Probably the problem is in a multiple access to the page by script and server software (i.e. file2ban) block access to pages. Maybe you’ll change the script to bypass such behavior?