How to generate a GET request in Google search?

Question

Google

There is a form of three fields for searching in Google: the request itself, on which site to search and the choice of http or https.
The request goes to the address

<form action="https://www.google.com/search?" method="get">

But the values ​​of the three fields are formed through an equal sign (=). Like this:

https://www.google.ru/search?q=запрос&+site:=sitename.ru&+inurl:=https

How to make it look like this:

https://www.google.ru/search?q=запрос+site:sitename.ru+inurl:https

I tried to combine three fields using JS, but the = sign is also inserted.
Without the participation of PHP or other languages, only in HTML. Maybe?