tomasinouk/CORS_on_OpenWRT_UCI.md

## CORS_on_OpenWRT_UCI.md

      
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              CORS_on_OpenWRT_UCI.md
            
          
    To implement Cross-Origin Resource Sharing (CORS) on OpenWRT within Luci is actually simple.
After very long search, I have found code in uHTTPd on gitlab, which clearly shows option for CORS. I haven't found anything, which would describe how to actually configure it.
There is nothing in uHTTPd documentation describing this functionally, /etc/config/uhttpd does not mention anything either.
Luckily, you can have a look into how the process is starting and what parameters is checking.
doing
cat /etc/init.d/uhttpd | grep cors
		append_bool "$cfg" ubus_cors "-X" 0
I have found configuration parameter, which I can set in /etc/config/uhttpd
This means, I can append another option to my configuration file.
config uhttpd 'main'
	option ubus_cors '1'
The Response Headers would changed to
HTTP/1.1 200 OK
Connection: Keep-Alive
Keep-Alive: timeout=20
Access-Control-Allow-Origin: http://localhost:8081
Access-Control-Allow-Headers: content-type
Access-Control-Allow-Methods: POST, OPTIONS
Access-Control-Allow-Credentials: true
Content-Type: application/json
Content-Length: 0

longer version would include

look into uhttpd main.c code
[https://github.com/mmaraya/uhttpd2/blob/master/main.c]
and check for function, which is checking the supplied parameters.
snippet from that section
#ifdef HAVE_UBUS
		"	-u string       URL prefix for UBUS via JSON-RPC handler\n"
		"	-U file         Override ubus socket path\n"
		"	-a              Do not authenticate JSON-RPC requests against UBUS session api\n"
		"	-X		Enable CORS HTTP headers on JSON-RPC api\n"
You can see that I need to run uhttpd with opton -X to enable CORS.
from here I searched in runtime for checking parameters.