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Precondition Required!
The server requires the request to be conditional
Help for Endusers
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What could be the reason for this?
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The action needs to meet certain conditions
What can I do about this?
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Avoid concurrent edits
Help for Professionals
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Additiona error details
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What could be the reason for this?
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Server requires conditional requests to prevent conflicts
What can I do about this?
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Include precondition headers such as If-Match
