# Cache some API requests in Nginx **URL:** \ **Category:** NGINX\ **Created:** [January 25, 2016, 7:53am UTC](https://www.ruby-forum.com/t/cache-some-api-requests-in-nginx/243911 "2016-01-25T07:53:06Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Post date:** [January 25, 2016, 7:53am UTC](https://www.ruby-forum.com/t/cache-some-api-requests-in-nginx/243911/1 "2016-01-25T07:53:06Z")
I’m seeking advise from experts here. We have the following scenario. We have a java application. Java app is running on tomcat7. tomcat7 acting as API server. User interface files ( Static html and css ) are served by nginx. Nginx is acting as reverse proxy here. All API request are passed to API server and rest are being server by nginx directly. What we want is to implement cache mechanism here. That is means we want to enable cache for all but with few exception. We want to exclude some API requests from being cached. Our configuration is like as shown below server { listen 443 ssl; server\_name ~^(?.+).ourdomain.com$; add\_header X-Frame-Options “SAMEORIGIN”; add\_header X-XSS-Protection “1; mode=block”; if ($request\_method !~ ^(GET|HEAD|POST)$ ) { return 405; } open\_file\_cache max=1000 inactive=20s; open\_file\_cache\_valid 30s; open\_file\_cache\_min\_uses 2; open\_file\_cache\_errors on; location / { root /var/www/html/userUI; location ~\* .(?:css|js)$ { expires 1M; access\_log off; add\_header Pragma public; add\_header Cache-Control “public, must-revalidate, proxy-revalidate”; } location ~\* .(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ { expires 1M; access\_log off; add\_header Pragma public; add\_header Cache-Control “public, must-revalidate, proxy-revalidate”; } } location /server { proxy\_pass [http://upstream/server](http://upstream/server); proxy\_set\_header Host $[subdomain.ourdomain.com](http://subdomain.ourdomain.com); proxy\_connect\_timeout 600; proxy\_send\_timeout 600; proxy\_read\_timeout 600; send\_timeout 600; proxy\_buffer\_size 4k; proxy\_buffers 4 32k; proxy\_busy\_buffers\_size 64k; proxy\_temp\_file\_write\_size 64k; proxy\_temp\_path /var/nginx/proxy\_temp; proxy\_next\_upstream error timeout invalid\_header http\_500 http\_502 http\_503 http\_504; proxy\_set\_header X-Forwarded-Host $host; proxy\_set\_header X-Forwarded-For $proxy\_add\_x\_forwarded\_for; proxy\_set\_header X-Forwarded-Server $host; proxy\_set\_header X-Real-IP $remote\_addr; proxy\_set\_header X-Forwarded-Proto https; proxy\_http\_version 1.1; proxy\_set\_header Upgrade $http\_upgrade; proxy\_set\_header Connection “upgrade”; proxy\_set\_header Host $host; proxy\_redirect off; proxy\_cache sd6; add\_header X-Proxy-Cache $upstream\_cache\_status; proxy\_cache\_bypass $http\_cache\_control; } ssl on; ssl\_certificate /etc/nginx/ssl/ourdomain.com.bundle.crt; ssl\_certificate\_key /etc/nginx/ssl/ourdomain.com.key; ssl\_protocols TLSv1 TLSv1.1 TLSv1.2; #ssl\_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4; ssl\_ciphers “EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH+aRSA+RC4 EECDH EDH+aRSA HIGH !RC4 !aNULL !eNULL !LOW !3DES !MD5 !EXP !PSK !SRP !DSS”; ssl\_dhparam /etc/nginx/ssl/dhparams.pem; ssl\_session\_cache builtin:1000 shared:SSL:10m; ssl\_prefer\_server\_ciphers on; ssl\_session\_timeout 24h; keepalive\_timeout 300; As above, we use cache only for static files located in /var/www/html/userUI We want to implement as such in location /server. This our api server. Means nginx passes api request to tomcat7 ( upstream ) server. We want to enable cache for specific API requests only but need to disable cache for rest of all requests. We want to do the following Exclude all json requests from cache and but need to enable cache for few. Request url will be something like as shown below Request URL:[https://ourdomain.com/server/user/api/v7/userProfileImage/get?loginName=user1&\_=1453442399073](https://ourdomain.com/server/user/api/v7/userProfileImage/get?loginName=user1&_=1453442399073) What this url does is to get the Profile image. We want to enable cache for this specific url. So condition we would like to use is , if request url contains “/userProfileImage/get” we want to set cache and all other requests shouldn’t cache. All our api request goes through [https://ourdomain.com/server/user/api/v7/](https://ourdomain.com/server/user/api/v7/) … To achieve this we changed the settings to following location /server { set $no\_cache 0; if ($request\_uri ~\* “/server/user/api/v7/userProfileImage/get\*”) { set $no\_cache 1; } proxy\_pass [http://upstream/server](http://upstream/server); proxy\_set\_header Host $[subdomain.ourdomain.com](http://subdomain.ourdomain.com); proxy\_connect\_timeout 600; proxy\_send\_timeout 600; proxy\_read\_timeout 600; send\_timeout 600; proxy\_buffer\_size 4k; proxy\_buffers 4 32k; proxy\_busy\_buffers\_size 64k; proxy\_temp\_file\_write\_size 64k; proxy\_temp\_path /var/nginx/proxy\_temp; proxy\_next\_upstream error timeout invalid\_header http\_500 http\_502 http\_503 http\_504; proxy\_set\_header X-Forwarded-Host $host; proxy\_set\_header X-Forwarded-For $proxy\_add\_x\_forwarded\_for; proxy\_set\_header X-Forwarded-Server $host; proxy\_set\_header X-Real-IP $remote\_addr; proxy\_set\_header X-Forwarded-Proto https; proxy\_http\_version 1.1; proxy\_set\_header Upgrade $http\_upgrade; proxy\_set\_header Connection “upgrade”; proxy\_set\_header Host $host; proxy\_redirect off; proxy\_cache sd6; add\_header X-Proxy-Cache $upstream\_cache\_status; proxy\_no\_cache $no\_cache; proxy\_cache\_bypass $no\_cache; } Below are the results of http responses General : Request URL:[https://ourdomain.com/server/common/...oginName=user1](https://ourdomain.com/server/common/...oginName=user1) Request Method:GET Status Code:200 OK Remote Address:131.212.98.12:443 Response Headers : Cache-Control:no-cache, no-store, must-revalidate Connection:keep-alive Content-Type:image/png;charset=UTF-8 Date:Fri, 22 Jan 2016 07:36:56 GMT Expires:Thu, 01 Jan 1970 00:00:00 GMT Pragma:no-cache Server:nginx Transfer-Encoding:chunked X-Proxy-Cache:MISS It would be great if someone could provide a solution. Posted at Nginx Forum: > **[Cache some API requests in Nginx](https://forum.nginx.org/read.php?2,264091,264091#msg-264091)** > > I'm seeking advise from experts here. We have the following scenario. We have a java application. Java app is running on tomcat7. tomcat7 acting as API server. User interface files ( Static html and css ) are served by nginx. Nginx is acting as...