Controller Changes

#CASingingRequest

CASingingRequest is used to make reachable the file needed by let's encrypt for CA signing.

#GET to POST Two commonly used methods for a request-response between a client and server:
GET - Requests data from a specified resource
POST - Submits data to be processed to a specified resource

For security reasons we have decided to use POST method instead of GET method, in login and subscribe function in the backend javascript code.

Technical comparison between GET and POST
When the method is GET, all form data is encoded into the URL, appended to the action URL as query string parameters.
With POST, form data appears within the message body of the HTTP request.

Example:
GET method we have:
/test/demo_form.asp?name1=value1&name2=value2
POST method we have:
POST /test/demo_form.asp HTTP/1.1 Host: sxpsecure.com name1=value1&name2=value2