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from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response from pip._internal.utils.typing import MYPY_CHECK_RUNNING if MYPY_CHECK_RUNNING: from typing import Iterator def response_chunks(response, chunk_size=CONTENT_CHUNK_SIZE): # type: (Response, int) -> Iterator[bytes] """Given a requests Response, provide the data chunks. """ try: # Special case for urllib3. for chunk in response.raw.stream( chunk_size, # We use decode_content=False here because we don't # want urllib3 to mess with the raw bytes we get # from the server. If we decompress inside of # urllib3 then we cannot verify the checksum # because the checksum will be of the compressed # file. This breakage will only occur if the # server adds a Content-Encoding header, which # depends on how the server was configured: # - Some servers will notice that the file isn't a # compressible file and will leave the file alone # and with an empty Content-Encoding # - Some servers will notice that the file is # already compressed and will leave the file # alone and will add a Content-Encoding: gzip # header # - Some servers won't notice anything at all and # will take a file that's already been compressed # and compress it again and set the # Content-Encoding: gzip header # # By setting this not to decode automatically we # hope to eliminate problems with the second case. decode_content=False, ): yield chunk except AttributeError: # Standard file-like object. while True: chunk = response.raw.read(chunk_size) if not chunk: break yield chunk