我想通过POSTMAN中的POST方法传递图像，但在请求行中得到None类型响应。files['image']
我试过很多不同的方法，但都没能解决这个问题。

from flask import Flask,jsonify
from flask import request
import face_recognition
import json

app = Flask(__name__)

@app.route('/')
def index():
   return ''

@app.route('/valid_faces', methods=['POST'])

def POST():
    if request.method == 'POST':

    # getting the images url from the request
    print('....')
    name1 = request.files['file'] if request.files.get('file') else None
    print('....')
    print (name1)        # name2 = request.form.get('name2')

    # map the url to the ones in the folder images
    firstImage = name1

    # loading the image inside a variable
    firstImage = face_recognition.load_image_file(firstImage)



    result=face_recognition.face_locations(firstImage)

    if result:
        # x={'valid_faces':True}
        # return jsonify(x)
        return "True"
    else:
        # x={'valid_faces':False}
        # return jsonify(x)
        return "False"

if __name__ == "__main__":
    app.run(debug=True)