scrapy使用代理ip_useragent怎么改

# 使用了fake库
from fake_useragent import UserAgent


# 配置headers
class RandomUserAgentMidddlware(object):
    # 随机更换user-agent
    def __init__(self, crawler):
        super(RandomUserAgentMidddlware, self).__init__()
        self.ua = UserAgent()
        # 从配置文件读取随机类型
        self.ua_type = crawler.settings.get('RANDOM_UA_TYPE', 'random')

    @classmethod
    def from_crawler(cls, crawler):
        return cls(crawler)

    def process_request(self, request, spider):
        # 通过配置文件的随机类型进行调用
        def get_ua():
            return getattr(self.ua, self.ua_type)

        request.headers.setdefault('User-Agent', get_ua())

# 使用了阿里云的IP代理服务
from myscrapy.aliproxy import get_proxy_ip


# 配置代理
class ProxyMiddleware(object):
    def process_request(self, request, spider):
        request.meta['proxy'] = get_proxy_ip()

DOWNLOADER_MIDDLEWARES = {
    'myscrapy.middlewares.MyscrapyDownloaderMiddleware': 543,
    'myscrapy.middlewares.RandomUserAgentMidddlware': 0,
    'myscrapy.middlewares.ProxyMiddleware': 1,
}

import urllib.request
import json


def get_proxy_ip():
    host = 'http://zip.market.alicloudapi.com'
    path = '/devtoolservice/ipagency'
    method = 'GET'
    appcode = 'xxxxxxxxxxxx'
    querys = 'foreigntype=0&protocol=0'
    bodys = {}
    url = host + path + '?' + querys

    request = urllib.request.Request(url)
    request.add_header('Authorization', 'APPCODE ' + "xxxxxxxxx")
    response = urllib.request.urlopen(request)
    content = response.read()
    if (content):
        load = json.loads(str(content, encoding='utf8'))
        address_ = load['result'][0]['address']
        return address_