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This article shows you how to use nginx in php to achieve a hotlink protection function, the content is concise and easy to understand, it will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Description: server A: source server, server B: target server

Scenario: an article from server An is crawled by server B through a crawler, but the picture link is accessed through server B.

At this point, a large number of pictures or too large files will cause bandwidth consumption to server A

Idea: add hotlink protection

Solution: handle it through hotlink protection

1. Judge by Referer [do not recommend referer for forgery, only raise the access threshold]

Install the nginx module ngx_http_referer_module for configuration to achieve the effect

two。 Verify through sgin (signature) [recommended signature algorithm verification is difficult to crack]

Install nginx module accesskey module

# enable accesskey accesskey on # set encryption mode md5 and sha-1 choose one of the two accesskey_hashmethod md5 | you can define accesskey_arg "sgin" by setting encryption parameters in sha-1;#; # set encryption algorithm according to the blogger's algorithm should be like this md5 (check_sign. Client IP) accesskey_signature "check_sign$remote_addr"; # restart nginx when you are done

Next, encrypt in php. If you authenticate without an encryption parameter, it will return 403.

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