ClientResponse Headers in SuiteScrip...

NetSuite developers often need to handle HTTP headers when integrating external services with SuiteScript. Understanding the differences between client and server contexts is crucial for accurate header management.

What Are ClientResponse Headers?

ClientResponse headers are a component of the HTTP response in NetSuite's SuiteScript environment. They provide key information about the response from an HTTP request.

How Do Headers Differ in Client and Server SuiteScript?

In client SuiteScript, the response.headers object can contain multiple values for the same header name. This is because HTTP allows multiple headers of the same name, and they are retrieved as a list of strings:

suitescript

// Client SuiteScript example
>>> response.headers["cache-control"]
[ "no-cache", "no-store" ]

Alternatively, in server SuiteScript, only the first value of the header is accessible due to legacy reasons. Therefore, if multiple identical headers exist, only the first one is retrieved:

suitescript

// Server SuiteScript example
>>> response.headers["cache-control"]
"no-cache"

Important Note: HTTP headers are case insensitive. It is advisable to retrieve headers using lowercase keys to avoid discrepancies, as NetSuite repeats each header in multiple cases.

What Are the Key Error Codes?

The READ_ONLY_PROPERTY error is triggered if you attempt to modify the response.headers property.

Who This Affects

NetSuite API Integrators: Those developing integrations where HTTP response inspection is needed.
Developers dealing with cross-platform SuiteScript execution: Understanding the difference in handling headers across client and server environments.

Key Takeaways

Client SuiteScript handles header values as lists, while server SuiteScript retrieves only the first value.
Headers are case insensitive; retrieve them using lowercase keys.
Headers are immutable; any attempt to modify them throws an error.

Frequently Asked Questions (4)

How are HTTP response headers accessed differently in Client SuiteScript compared to Server SuiteScript?

In Client SuiteScript, HTTP response headers are returned as an array of strings, allowing multiple values for the same header. In Server SuiteScript, headers are returned as a single string, meaning only the first value for a header with multiple values will be accessible.

What happens if you attempt to modify HTTP response header properties in SuiteScript?

Attempting to modify HTTP response header properties will result in a 'READ_ONLY_PROPERTY' error because these properties are non-editable.

Are there any restrictions on setting certain HTTP headers in the N/http module of SuiteScript?

Yes, certain HTTP headers such as 'Connection', 'Content-Length', and 'Host' cannot be set manually within the N/http module. Any attempt to set these headers will result in the values being discarded.

Why is it recommended to use lower-case when retrieving specific HTTP headers in SuiteScript?

It is recommended to use lower-case when retrieving specific HTTP headers because, although they are case-insensitive, it is considered best practice to ensure consistency and avoid potential issues with header names.

ClientResponse Headers in SuiteScript Integration