ngx_print_escape 函数只在 NGX_HTTP_UPSTREAM_CHECK 开启时定义 #8
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ngx_print_escape 函数只在 NGX_HTTP_UPSTREAM_CHECK 开启时定义,否则gcc会报一个「定义后未使用」的错误,而且该函数只在NGX_HTTP_UPSTREAM_CHECK开启的时候才会被调用,所以将函数定义也放在upstream check中也更合适。