[Python] Not receiving headers Scrapy ProxyMesh

I am quite new to Scrapy / ProxyMesh. My request to the Proxymesh server seems to be working as I see my bandwith consumption on the ProxyMesh website, and the meta.proxy is correct in my logs. However, when I log the response headers in Scrapy, I do not receive the X-Proxymesh-IP that I am supposed to receive. Here is my code. What am I doing wrong?

This is my middleware

class Proxymesh(object):

def __init__(self):

logging.debug('Initialized Proxymesh middleware')

self.proxy_ip = 'http://hostort'

def process_request(self, request, spider):

logging.debug('Processing request through proxy IP: ' + self.proxy_ip)

request.meta['proxy'] = self.proxy_ip


These are my settings in my spider

custom_settings = {
"DOWNLOADER_MIDDLEWARES": {
"projectName.middlewares.proxymesh.Proxymesh" : 1,
}


This is what the response headers look like

['Set-Cookie']:['__cfduid=d88d4e4cb7... HttpOnly']
['Vary']:['User-Agent,Accept-Encoding']
['Server']:['cloudflare-nginx']
['Date']:['Thu, 19 Oct 2017 10...38:10 GMT']
['Cf-Ray']:['3b031b30cbef1565-CDG']
['Content-Type']:['text/html; charset=UTF-8']


Thank you for your help

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