Why botium-box HTTP(S)/JSON connector request is empty?

This is my demo code:

from flask import Flask , jsonify, request, render_template
import json
app = Flask(__name__)
@app.route('/t',methods=['GET','POST'])
def t():
    print(request.data)
    print (request.headers)
    return jsonify({"test":"test"})
if __name__ =='__main__':
    app.run(debug=True,host="0.0.0.0",port=5000)

When I use the Generic HTTP(S)/JSON Connector and to Click CHECK CONNECTIVITY Button, it response a "test" for text.

but I see the logs , the header is empty. The logs is below:

192.168.58.119 - - [17/Aug/2020 15:24:35] "[37mGET /t HTTP/1.1[0m" 200 -
b''
Host: 192.168.58.145:5000
Connection: close

The connectivity is successful.

How to get the botium box query text in the http headers?

thanks!