不能忽略的Nginx做web服务器的favicon.ico图像找不到问题

我们在使用Nginx搭建HTTP的web server的过程中，一般都很顺利，默认的网站根目录一般是/usr/local/nginx/html，我们也可以正常访问到Nginx的欢迎信息，比如使用下面的网址：

http://localhost/

但是发现运行一段时间后，Nginx的error日志中会定期抱怨说，没有找到favicon.ico文件？

发生这种错误的原因一般是Nginx在根目录上找不到这个文件。我们可以在网上下载一个ico文件放在根目录下面就可以了。但是现在的业务场景有些区别：

我使用Nginx作为前台服务器，在80端口接收所有的http请求，对本地能缓存的资源直接提供服务，否则转发到upstream上的其他服务器处理，比如转给fastDFS，或者是ATS等等，下面的nginx.conf是一个例子：

user  www www;
worker_processes  4;

error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

pid        logs/nginx.pid;
worker_rlimit_nofile 65535;
google_perftools_profiles /tmp/tcmalloc;

events {
    worker_connections  65535;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    server_tokens off;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    server_names_hash_bucket_size 128;
    client_header_buffer_size 32k;
    large_client_header_buffers 4 32k;
    client_max_body_size 50m;

    sendfile        on;
    tcp_nopush      on;
    tcp_nodelay     on;

    #keepalive_timeout  0;
    keepalive_timeout  60;

    fastcgi_connect_timeout 300;
    fastcgi_send_timeout 300;
    fastcgi_read_timeout 300;
    fastcgi_buffer_size 64k;
    fastcgi_buffers 4 64k;
    fastcgi_busy_buffers_size 128k;
    fastcgi_temp_file_write_size 256k;
    fastcgi_intercept_errors on;

    gzip  on;
    gzip_min_length 1k;
    gzip_buffers 4 16k;
    gzip_http_version 1.0;
    gzip_comp_level 2;
    gzip_types text/plain application/x-javascript text/css application/xml;
    gzip_vary on;

    upstream ats {
        server 127.0.0.1:8081;
    }

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
            proxy_pass http://ats$request_uri;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            expires 2h;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        location /test-js {
            root html;
            try_files $uri /;
            expires 10d;
        }

        location /test-img {
            root html;
            try_files $uri /;
            expires 10d;
        }

        location /test-html {
            root html;
            try_files $uri /;
            expires 10d;
        }

        # just use for taoyx test
        location /taoyx-test {
            root html;
        }

        # just for tulu test
        location /tulu {
            root html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.php$ {
            root           html;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  /usr/local/nginx/html$fastcgi_script_name;
            include        fastcgi_params;
        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443;
    #    server_name  localhost;

    #    ssl                  on;
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_timeout  5m;

    #    ssl_protocols  SSLv2 SSLv3 TLSv1;
    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers   on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

我现在在根目录下存放一个ico文件，如何让Nginx直接去本地拿这个文件，而不转发给其他服务器呢？直接在nginx.conf中增加下面一行就可以了：

        # set site favicon
        location /favicon.ico {
            root html;
        }

下面按照我的配置，访问Nginx的欢迎页面就可以正常看到ico图标了：