Is server send response to referer link or the same origin link?

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webservice

Hello Everyone!

In http request/response messages, client request to a server as below

http request [
GET /js/standaloneMozLoop.js HTTP/1.1
Host: hello.firefox.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://hello.firefox.com/dJ_9SWkcHjE
Cookie: _ga=GA1.2.1623609526.1426832126; _gat=1
Connection: keep-alive]

and server response back to the client with http response message as below

http response [
HTTP/1.1 200 OK
Content-Encoding: gzip
Content-Security-Policy: frame-ancestors 'self'
Content-Type: text/css
Date: Fri, 20 Mar 2015 07:52:14 GMT
Last-Modified: Tue, 10 Mar 2015 18:57:07 GMT
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Content-Length: 716
Connection: keep-alive
].

My doubt is whether the server replies response to the referer link or host link

Referer: https://hello.firefox.com/dJ_9SWkcHjE

or

Host: hello.firefox.com