# (52) Empty reply from server **URL:** \ **Category:** NGINX\ **Created:** [April 14, 2016, 12:04pm UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459 "2016-04-14T12:04:56Z")\ **Posts on this page:** 6\ **Page:** 2
**Author:** ![Pankaj\_Chaudhary](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f04885/32.png) [@Pankaj\_Chaudhary](https://www.ruby-forum.com/u/Pankaj_Chaudhary)\ **Post date:** [May 5, 2016, 6:58am UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459/21 "2016-05-05T06:58:04Z")
Hi, thank you! My module is basically for resource protection. I have already running my module on other servers also. My module follow below steps. -Generate cookie and write in response header -read from header when cookie is needed IIS have API setheader() to set header and getheader() to get header. Apache have apr\_table\_get() to get value from header and apr\_table\_set() to set the value in header. Do we have similar APIs in nginx? How i can achieve same kind of behavior in nginx? Regards, Pankaj On Wed, May 4, 2016 at 7:16 PM, Valentin V. Bartenev [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![Pankaj\_Chaudhary](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f04885/32.png) [@Pankaj\_Chaudhary](https://www.ruby-forum.com/u/Pankaj_Chaudhary)\ **Post date:** [May 2, 2016, 9:12am UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459/22 "2016-05-02T09:12:29Z")
* * * nginx mailing list removed\_email\_address@domain.invalid [http://mailman.nginx.org/mailman/listinfo/nginx](http://mailman.nginx.org/mailman/listinfo/nginx) ---
**Author:** ![Pankaj\_Chaudhary](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f04885/32.png) [@Pankaj\_Chaudhary](https://www.ruby-forum.com/u/Pankaj_Chaudhary)\ **Post date:** [May 5, 2016, 4:03pm UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459/23 "2016-05-05T16:03:04Z")
On Thursday 05 May 2016 10:27:46 Pankaj Chaudhary wrote: > Apache have apr\_table\_get() to get value from header and apr\_table\_set() to > set the value in header. > > Do we have similar APIs in nginx? > > How i can achieve same kind of behavior in nginx? [..] If you want to set a response header, then should look to the source of ngx\_http\_headers\_module, which is responsible for adding headers to output. For reading cookies you can look to the $http\_cookie variable implementation. Please, use “grep” for search and read the code. You can implement your module a way easier if you just provide a directive, that can use the variable to read some value, and adds a variable to set the value. Then it can be used like this: protection\_value $cookie\_key; add\_header Set-Cookie “key=$protection\_value”; You can also check the ngx\_http\_secure\_link\_module: > **[Module ngx\_http\_secure\_link\_module](http://nginx.org/en/docs/http/ngx_http_secure_link_module.html)** wbr, Valentin V. Bartenev ---
**Author:** ![Pankaj\_Chaudhary](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f04885/32.png) [@Pankaj\_Chaudhary](https://www.ruby-forum.com/u/Pankaj_Chaudhary)\ **Post date:** [May 9, 2016, 11:05am UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459/24 "2016-05-09T11:05:00Z")
Hi, Its means nginx do not have any API as other server having to set header and get header ? very strange … I need to write my own module to read and write cookies values? My module is in written in C programming language. On Thu, May 5, 2016 at 7:32 PM, Valentin V. Bartenev [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![Pankaj\_Chaudhary](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f04885/32.png) [@Pankaj\_Chaudhary](https://www.ruby-forum.com/u/Pankaj_Chaudhary)\ **Post date:** [May 11, 2016, 8:49am UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459/25 "2016-05-11T08:49:37Z")
> You can read the headers\_in data structure, and write the headers\_out > data structure, as the examples show. I was able to write in headers\_out data structure as i have shown my code already but i was not able to read from headers\_in structure that is problem i am facing. I am looking solution for this only. I have followed the given example mentioned in below link. > **[F5 NGINX: Built for cloud-native apps. Ready for AI traffic.](https://www.f5.com/products/nginx)** > > Deliver modern applications with NGINX. Explore high-performance load balancing, API gateways, and web server solutions trusted by top global enterprises. i am not able to understand why this is happening. but if i can see headers\_in structure have the value which i am trying to read. ---
**Author:** ![Pankaj\_Chaudhary](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f04885/32.png) [@Pankaj\_Chaudhary](https://www.ruby-forum.com/u/Pankaj_Chaudhary)\ **Post date:** [May 10, 2016, 10:47pm UTC](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459/26 "2016-05-10T22:47:22Z")
On Mon, May 09, 2016 at 02:34:13PM +0530, Pankaj Chaudhary wrote: Hi there, > Its means nginx do not have any API as other server having to set header > and get header ? very strange … You are correct. You’ve already shown code where you read headers sent by the client, and write headers sent to the client. It is very strange. > I need to write my own module to read and write cookies values? > My module is in written in C programming language. If you want to write a module in C, then your code will be in C. You can read the headers\_in data structure, and write the headers\_out data structure, as the examples show. Good luck with it, ## f Francis D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) [Previous page](https://www.ruby-forum.com/t/52-empty-reply-from-server/244459.md?page=1)