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When a multipart file part used `Content-Transfer-Encoding: base64` and
the non-whitespace base64 bytes did not align to a multiple of 4 within
a chunk, the parser entered a loop calling `field_stream.read(1-3)` once
per whitespace byte. Each such call fetched the entire internal buffer,
sliced off 1-3 bytes, and pushed the remainder back via unget(), doing
an O(n) memory copy per call. A 2.5 MB payload of mostly whitespace
produced CPU amplification relative to a normal upload of the same size.
The alignment loop now reads `self._chunk_size` bytes at a time, and
accumulates stripped parts in a list joined once at the end.
Thanks to Seokchan Yoon for the report and the fixing patch.
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encoding.
Added LookupError to the except clause so invalid headers are silently
skipped, consistent with other malformed header handling.
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parse_header_parameters for multipart requests.
Header parsing should apply only to the header value. The previous
implementation happened to work but relied on unintended behavior.
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Rewrapped long docstrings and block comments to 79 characters + newline
using script from https://github.com/medmunds/autofix-w505.
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HttpRequest.get_full_path_info() examples.
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headers.
This also allow customizing the maximum size of headers via
MAX_TOTAL_HEADER_SIZE.
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application/x-www-form-urlencoded content type.
Thanks Eki Xu for the report.
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HttpRequest and subclasses."
This reverts commit 6220c445c40a6a7f4d442de8bde2628346153963.
Thanks Adam Johnson and Márton Salomváry for reports.
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This avoids a collision when third-party database backends depend on the
Requests HTTP library.
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