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ASP0019: Suggest using IHeaderDictionary.Append or the indexer

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Value
Rule ID ASP0019
Category Usage
Fix is breaking or non-breaking Non-breaking

Cause

IDictionary.Add isn't recommended for setting or appending headers. IDictionary.Add throws an ArgumentException when attempting to add a duplicate key.

Rule description

IDictionary.Add isn't recommended for setting or appending headers.

How to fix violations

To fix a violation of this rule, use IHeaderDictionary.Append or the indexer to append or set headers.

When to suppress warnings

Do not suppress a warning from this rule.