Error calling BaseHTTPRequestHandler.end_headers()

Bug report

Bug description:

If a call is made to BaseHTTPRequestHandler.end_headers() but no headers or response have been queued, an exception is raised exposing implementation details.

    class request_handler(BaseHTTPRequestHandler):
        def do_GET(self):
            self.end_headers()

Actual result

AttributeError("'request_handler' object has no attribute '_headers_buffer'")

Expected result:

pass

flush_headers has a guard to check if the buffer has been allocated which is missing from end_headers

if hasattr(self, '_headers_buffer'):

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-131718

Comienza localizando BaseHTTPRequestHandler.end_headers() de CPython y compara su gestión con flush_headers(), especialmente la comprobación de _headers_buffer descrita en el informe. Se considera completado cuando llamar a end_headers() sin encabezados encolados ni una respuesta se completa sin exponer un AttributeError; revisa el PR vinculado gh-131718 antes de comenzar.