Bug report

Bug description:

While trying to use read1 in urllib3, we discovered that read1 unlike read never closes the response after reading all data when the content length is known (urllib3/urllib3#3235).

import http.client

conn = http.client.HTTPSConnection("www.python.org")
conn.request("GET", "/")
response = conn.getresponse()

This runs successfully:

response.read()
assert response.isclosed()

This fails:

while response.read1():
    pass
assert response.isclosed()

CPython versions tested on:

3.8, 3.9, 3.10, 3.11, 3.12, 3.13, CPython main branch

Operating systems tested on:

Linux, macOS, Windows

Linked PRs

• gh-113199: Make read1 and readline of HTTPResponse close IO after reading all data #113200
• [3.12] gh-113199: Make read1() and readline() of HTTPResponse close IO after reading all data (GH-113200) #113259
• [3.11] gh-113199: Make read1() and readline() of HTTPResponse close IO after reading all data (GH-113200) #113260