Handling Errors in Server Response Headers for SuiteScript

TL;DR: This article explains how to handle errors related to server response headers in SuiteScript, specifically using the N/http module. Learn the implications of read-only properties and how to correctly log server response headers.

What Are Server Response Headers?

In SuiteScript, the server response headers are used to convey additional information back to the client. They are crucial for managing HTTP requests and responses effectively.

Understanding Server Response Headers

The server response headers are read-only objects that return values in an array format when multiple values are assigned to a single header name. For example:

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

When you're working with server response headers, it’s important to treat this as an object, and you should not attempt to modify it directly.

Common Errors

Error Code: READ_ONLY_PROPERTY

This error is thrown if there's an attempt to edit a property of the server response headers. Since this object is inherently read-only, any modification will result in this error message, which can hinder your app's functionality if not handled correctly.

Working with Server Response Headers

When using the N/http module, logging the server response headers can help debug issues related to HTTP requests. Here’s a syntax example for logging headers:

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

Important Considerations

Utilize the N/http module progressively, and remember that certain headers cannot be manually set. For example, headers like Connection, Content-Length, and Host are blocked. If your script tries to set these values, they will be discarded silently, which could lead to unexpected results. Keep this in mind when debugging network-related errors.

Key Tips

• Always check the HTTP headers you are attempting to set to avoid the blocked list.
• Employ logging generously while working with the N/http module to diagnose potential header issues.
• Be aware that the N/http module cannot handle HTTPS requests; use the N/https module instead for secure transactions.

Who This Affects

This information is particularly relevant to:

• Developers: who are integrating HTTP requests into SuiteScript applications.
• Administrators: who need to troubleshoot server response issues in workflows.

Key Takeaways

• Server response headers in SuiteScript are read-only and must not be modified.
• Attempting to edit these headers results in a READ_ONLY_PROPERTY error.
• Logging is essential for debugging issues related to server response headers.
• Specific blocked headers should always be considered to avoid silent failures.

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