[fix] handle proxied https scheme with uwsgi

searx/webapp.py

 
 from datetime import datetime, timedelta
 from urllib import urlencode
+from werkzeug.contrib.fixers import ProxyFix
 from flask import (
     Flask, request, render_template, url_for, Response, make_response,
     redirect, send_from_directory
 
 application = app
 
+app.wsgi_app = ProxyFix(application.wsgi_app)
+
 
 if __name__ == "__main__":
     run()