Support for sending file with POST request

src/rembg/cmd/server.py

@@ -5,13 +5,12 @@ from urllib.request import urlopen
 
 from flask import Flask, request, send_file
 from waitress import serve
-import os
 
 from ..bg import remove
 
-
 app = Flask(__name__)
 
+
 @app.route('/', methods=['GET', 'POST'])
 def index():