HTTP2 protocol is replacement of HTTP1.1 protocol, Its based on SPDY, HTTP2 is more efficient, more secure and faster data transfer in applications.

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You may get a below error while installing NGINX, the HTTP rewrite module requires the PCRE library.

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Once you have done the Nagios client installation and configuration in your system then, you may getting an error HTTP-WARNING : 403 Forbidden like below image,

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