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doc/protocols: document cache option
Add entry for read_ahead_limit
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@ -175,6 +175,16 @@ Caching wrapper for input stream.
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Cache the input stream to temporary file. It brings seeking capability to live streams.
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The accepted options are:
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@table @option
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@item read_ahead_limit
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Amount in bytes that may be read ahead when seeking isn't supported. Range is -1 to INT_MAX.
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-1 for unlimited. Default is 65536.
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@end table
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URL Syntax is
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@example
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cache:@var{URL}
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@end example
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