我需要在下载响应之前修改我的请求网址。但我无法改变它。即使使用修改请求网址后request.replace(url=new_url), the process_response打印未修改的 url。这是中间件的代码：
def process_request(self, request, spider):
original_url = request.url
new_url= original_url + "hello%20world"
print request.url # This prints the original request url
request=request.replace(url=new_url)
print request.url # This prints the modified url
def process_response(self, request, response, spider):
print request.url # This prints the original request url
print response.url # This prints the original request url
return response
谁能告诉我我在这里缺少什么吗？
由于您正在修改request对象在process_request()- 你需要把它返还:
def process_request(self, request, spider):
# avoid infinite loop by not processing the URL if it contains the desired part
if "hello%20world" in request.url: pass
new_url = request.url + "hello%20world"
request = request.replace(url=new_url)
return request
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