Can not get certificate information when http body is empty.

Description

Can not get certificate information when http body is empty.

Steps to Reproduce

Here is the Code:

# -*- coding: utf-8 -*-
import scrapy
class TestSpider(scrapy.Spider):
    name = 'test'
    # 49.235.192.63:443
    start_urls = ['https://49.235.192.63/', ]
    handle_httpstatus_list = [i for i in range(199, 600)]  # handle all response

    def parse(self, response):
        if response.certificate:
            cert = response.certificate.inspect()
        else:
            cert = ""
        print("Cert is --->", cert)

Expected behavior: [What you expect to happen] cert is not empty Actual behavior: [What actually happens] cert is empty Reproduces how often: [What percentage of the time does it reproduce?] every time

Versions

Scrapy : 2.0.1 lxml : 4.5.0.0 libxml2 : 2.9.10 cssselect : 1.1.0 parsel : 1.5.2 w3lib : 1.21.0 Twisted : 20.3.0 Python : 3.7.5 (default, Nov 20 2019, 09:21:52) - [GCC 9.2.1 20191008] pyOpenSSL : 19.1.0 (OpenSSL 1.1.1d 10 Sep 2019) cryptography : 2.8 Platform : Linux-5.3.0-45-generic-x86_64-with-Ubuntu-19.10-eoan

Additional context

this connectionMade won’t be called when the response has nobody. I do not know how to resolve and need your help. https://github.com/scrapy/scrapy/blob/dfbe1d95071acfbba159cea051530749b1684460/scrapy/core/downloader/handlers/http11.py#L467 Thanks so much! #4054

[michalp2213]

I reproduced this behavior of protocol.transport.getPeerCertificate() I mentioned above in a fairly short piece of code and created a ticket in twisted issue tracker.

[Gallaecio]

This is probably not a beginner-friendly issue.