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Thanks for looking at this. Perhaps you weren’t pasting the HTTP response into "socat". After the six request lines are printed out, I enter the five lines between <HTTP response start> and <HTTP response end>; I didn’t really make this obvious. Otherwise, urlopen() hangs waiting for the response and read() never even gets called.
Here’s a Python-only HTTP server to demonstrate without needing "socat". Run this in one terminal:
from http.server import HTTPServer, BaseHTTPRequestHandler
class Handler(BaseHTTPRequestHandler):
 protocol_version = "HTTP/1.1"
 def do_GET(self):
 self.send_response(200)
 self.send_header("Transfer-Encoding", "chunked")
 self.end_headers()
 self.wfile.write(b"0\r\n\r\n")
HTTPServer(("", 8000), Handler).serve_forever()
. . . and in another terminal:
from urllib.request import urlopen
with urlopen("http://localhost:8000") as response:
 response.read()
import gc; gc.collect()