How To Capture json data with python?

I’m sending form data using JavaScript through Ajax in Json format to the python script ( wsgiref ), so it can capture this data and return the response in json format. The problem I face boils down to a server error 500, where I can’t reach the objective of capturing the data and being able to return the answer, below is the code:

Ajax, Json Code :

        <script>
            const next = document.querySelector(".btn-large")
            const text = next.innerHTML = "Seguinte"
 
            next.onclick = function() {
 
                let ws_safe_email = document.querySelector(".ws_input_email").value
 
                const jsonData = {
                    "ws_safe_email": ws_safe_email
                }
 
                const jsonSend = JSON.stringify(jsonData)
 
                const ajax = new XMLHttpRequest()
                ajax.open("POST", "http://127.0.0.1:8080/", true)
                ajax.setRequestHeader("Content-Type", "application/json")
                ajax.send(jsonSend)
 
                if(ajax.readyState === 4) {
                    if(ajax.status === 200) {
                        alert("Received Data")
                    }
                }
            }
        </script>

Python Code :

from wsgiref.simple_server import make_server
# Module name : cgi -> ( https://docs.python.org/3/library/cgi.html#module-cgi )
import cgi, json
 
 
def apps(environ, start_response):
 
    # Function -> Capture the request method:
    v_mtd = environ["REQUEST_METHOD"]
    # Function -> Capture the request form data:
    v_inp = cgi.FieldStorage(environ["wsgi.input"], environ=environ)
 
    if v_mtd == "GET":
 
        # Acessa o arquivo static requisitado :
        file = open("index.html", "r")
        # Faz a leitura do arquivo :
        sile = file.read()
 
        status = "200 OK"
        headers = [("Content-type", "text/html; charset=utf-8")]
        start_response(status, headers)
 
        # The returned object is going to be printed
        return [str(sile).encode('utf-8')]
 
    if v_mtd == "POST":
        ...
 
with make_server("", 8080, apps) as httpd:
 
    print("Serving on port 8080...")
    # Serve until process is killed
    httpd.serve_forever()