Server Response Headers Management in SuiteScript

The server response headers are essential in managing HTTP requests and responses within SuiteScript. This article covers their syntax, usage, and limitations to help developers ensure proper script functionality when making HTTP calls.

What Are Server Response Headers?

Server response headers provide metadata regarding the response sent from the server. They can relay information such as content type, caching policies, and allowed HTTP methods. In SuiteScript, these headers can be accessed but are read-only.

Syntax and Access

The server response headers are accessible through the ServerResponse object, specifically using the headers property:

// Sample code to log server response headers
log.debug({
    title: "Server Response Headers",
    details: ServerResponse.headers
});

In the above example, ServerResponse.headers returns all header values as an object. If multiple values exist for a single header name, they are returned as an array, demonstrated below:

{Vary: ['Accept-Language', 'Accept-Encoding']}

Read-Only Property

It's important to note that ServerResponse.headers is a read-only property. If you attempt to modify these headers in your scripts, you will encounter the following error:

• Error Code: READ_ONLY_PROPERTY
  • Thrown If: You attempted to edit this property.

HTTP Header Information

HTTP headers are critical as they allow the passage of additional information with HTTP requests and responses. Each header is formatted as a case-insensitive name followed by a colon and its value. While custom headers can enhance your application, ensure their names do not include underscores, as per HTTP standards.

Blocked HTTP Headers in NetSuite

When working with the N/http module, be aware of certain headers that you cannot set manually, as attempts to set these headers will discard the values. Some of the common blocked headers include:

This restriction ensures compatibility and security within the NetSuite environment.

Conclusion

Understanding the management of server response headers is vital for effective SuiteScript development. By utilizing the N/http module appropriately and adhering to the constraints set by NetSuite, developers can create robust and compliant applications.

Source: This article is based on Oracle's official NetSuite documentation.

Key Takeaways

• Server response headers are accessible and read-only in SuiteScript.
• Modifying headers will trigger a READ_ONLY_PROPERTY error.
• Certain HTTP headers are blocked when using the N/http module.
• Proper header management enhances application performance and security.