Misc #11329 ยป 0001-Improved-documentation-grammar-for-open-uri-open-opt.patch
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# is called before actual transfer is started.
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# It takes one argument, which is expected content length in bytes.
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#
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# If two or more transfer is done by HTTP redirection, the procedure
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# is called only one for a last transfer.
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# If two or more transfers are performed by HTTP redirection, the
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# procedure is called only once for the last transfer.
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#
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# When expected content length is unknown, the procedure is called with
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# nil. This happens when the HTTP response has no Content-Length header.
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