How to parse HTTP parameters?

Question

I'm in a web server project with a mate developing everything from 0.

We are doing pretty well so far. Now we are working into the http parameters parser and got stuck.

What i want to do: Parse the http parameters from the url and the request body (POST parameters).

How should they look:

http.urlParams = { "key:value", "key:value", ... }

http.postParams = { "key:value", "key:value", ... }

What i got:

http.action = "example.php"
http.rawUrlParams = "name=manolo&age=26";
http.rawPostParams = "user=manolo&password=12345678";

Problems:

• I don't know how to handle that url params can have every caracter. Example: https://example.com/index.php?question=how_are_you?&response=good==true&&fine=true&xD&xD2=&example&&&??&

Questions:

• Is there any set of instructions about how i should make the parser?

• Do you know any function that does just that?

• Should i be concerned about something i'm missing?

Misc: I'm expecting browsers as http clients.

I'm doing everything from cero, so pls don't send me a lib that weigths 20 times my server size just for parse parameters.

Don't send me links without code explanation.