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nginx で SSL解きリバースプロキシな設定のお作法


nginx, ときどき httpd で出来てたことが出来なくて「えっ?」てなる。今後のためにメモ。

server {
       listen         80;
       server_name    www.example.com;
       rewrite        ^ https://$http_host$request_uri? permanent;

server {
       listen         443;
       server_name    www.example.com;

       ssl on;
       ssl_certificate ...
       ssl_certificate_key ...

       location / {
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-Proto https;
             proxy_set_header X-Forwarded-Host $host;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

             proxy_pass http://backend.example.com/;
             proxy_redirect http:// https://;

ポイントは proxy_redirect http:// https://; の行。後ろが頭のいい奴(例:Rails)だと、X-Forwarded-Proto を見てよしなにヘッダを吐いてくれるんだけど、X-Forwarded-Proto 見てくれない奴が裏側にいる場合には、これで Location ヘッダなんかを強制的に https:// に書き換える必要がある。

apache httpd で言うところの ProxyPassReverse ですな。こっちの方が融通利くみたい。

ちなみに nginx の $http_host と $host は同じようでいて微妙に違うらしい > ネタ元

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