Modify, add, remove, or pass along specific response headers going downstream towards the client.
Why do you need it?
Use this behavior to decide how selected request headers going downstream towards the client should be processed. For example, you can add or modify various access control headers to control which headers should be available for the scripts running in the user’s browser. By controlling the content of your headers, you can further customize your website visitor’s experience and gain insight into how it is used.
How it works
When enabled, this behavior modifies the specified outgoing response header according to set rules. A response header added using this behavior is effectively added after the response is processed by the Akamai server and retrieved either from the customer origin or from the cache, immediately before it is sent to the requesting client. This means that you can add a header that is specific to the user making the request, without affecting the cached object. This is in contrast to the Modify Incoming Response Header behavior, which adds the response header before the object is processed by the Akamai server, so if the response is cacheable, the header will be stored with the cached object.
Features and options
| Field | What it does | Sub-options |
|---|---|---|
| Action | You may add, remove, modify (equivalent to an add and a remove), or find & replace outgoing HTTP response headers. |
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| Select Header Name | Select from standard pre-defined headers to modify. |
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| Header Value | Enter your HTTP header value.
Variable Support: This option supports variable expression syntax. Typing |
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| Custom Header Name | With Select Header Name set to Other…, enter a custom HTTP header name.
Variable Support: This option supports variable expression syntax. Typing |
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| New Header Value | With Action set to Modify, enter your new HTTP header value.
Variable Support: This option supports variable expression syntax. Typing |
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| Avoid Duplicate Headers | With Action set to Modify, prevent multiple headers with the same name from being created. Note that this applies only to headers added using this behavior – it does not apply to headers added at the origin. | |
| Find What | With Action set to Find & Replace, enter a string to match.
Variable Support: This option supports variable expression syntax. Typing |
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| Replace With | With Action set to Find & Replace, enter a string to replace the matched string.
Variable Support: This option supports variable expression syntax. Typing |
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| Occurrences | With Action set to Find & Replace, select whether to replace only the first instance of the old value or to replace every occurrence. |
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