nginx中的两个模块的proxy_pass的区别解析

server {    listen 127.0.0.1:12345;    proxy_pass 127.0.0.1:8080;} server {    listen 12345;    proxy_connect_timeout 1s;    proxy_timeout 1m;    proxy_pass example.com:12345;} server {    listen 53 udp;    proxy_responses 1;    proxy_timeout 20s;    proxy_pass dns.example.com:53;} server {    listen [::1]:12345;    proxy_pass unix:/tmp/stream.socket;

server {    listen      80;    server_name www.test.com;     # 情形A    # 访问 http://www.test.com/testa/aaaa    # 后端的request_uri为: /testa/aaaa    location ^~ /testa/ {        proxy_pass http://127.0.0.1:8801;    }        # 情形B    # 访问 http://www.test.com/testb/bbbb    # 后端的request_uri为: /bbbb    location ^~ /testb/ {        proxy_pass http://127.0.0.1:8801/;    }     # 情形C    # 下面这段location是正确的    location ~ /testc {        proxy_pass http://127.0.0.1:8801;    }     # 情形D    # 下面这段location是错误的    #    # nginx -t 时，会报如下错误:     #    # nginx: [emerg] "proxy_pass" cannot have URI part in location given by regular     # expression, or inside named location, or inside "if" statement, or inside     # "limit_except" block in /opt/app/nginx/conf/vhost/test.conf:17    #     # 当location为正则表达式时，proxy_pass 不能包含URI部分。本例中包含了"/"    location ~ /testd {        proxy_pass http://127.0.0.1:8801/;   # 记住，location为正则表达式时，不能这样写！！！    }     # 情形E    # 访问 http://www.test.com/ccc/bbbb    # 后端的request_uri为: /aaa/ccc/bbbb    location /ccc/ {        proxy_pass http://127.0.0.1:8801/aaa$request_uri;    }     # 情形F    # 访问 http://www.test.com/namea/ddd    # 后端的request_uri为: /yongfu?namea=ddd    location /namea/ {        rewrite    /namea/([^/]+) /yongfu?namea=$1 break;        proxy_pass http://127.0.0.1:8801;    }     # 情形G    # 访问 http://www.test.com/nameb/eee    # 后端的request_uri为: /yongfu?nameb=eee    location /nameb/ {        rewrite    /nameb/([^/]+) /yongfu?nameb=$1 break;        proxy_pass http://127.0.0.1:8801/;    }     access_log /data/logs/www/www.test.com.log;} server {    listen      8801;    server_name www.test.com;        root        /data/www/test;    index       index.php index.html;     rewrite ^(.*)$ /test.php?u=$1 last;     location ~ /.php$ {        try_files $uri =404;        fastcgi_pass unix:/tmp/php-cgi.sock;        fastcgi_index index.php;        include fastcgi.conf;    }     access_log /data/logs/www/www.test.com.8801.log;}