How to pass cookies to azure load test

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When using Azure Load Testing and sending HTTP requests directly (not through JMeter), passing cookies via the "cookie" header in the request may not work as expected due to how Azure Load Testing manages request headers internally.

Root Cause:

Azure Load Testing might sanitize or omit certain headers (like Cookie) for security reasons or due to its internal HTTP client behavior. Some HTTP clients ignore manual cookie headers and expect cookie management to go through a cookie jar or cookie container.

Workarounds

Option 1: Use headers but with a custom header

If your backend does not strictly require the standard Cookie header and you control the backend, you can pass cookies as a custom header like:

"headers": { "x-cookie-data": "sessionid=abc123; token=xyz456" }

Then, read x-cookie-data in the backend and process it as needed.

Option 2: Switch to JMeter for cookie handling

If you must use the Cookie header and cannot modify backend expectations, consider:

• Switching to JMeter-based tests (which Azure Load Testing supports).
• JMeter handles cookies natively via HTTP Cookie Manager.

Since you are using requestbased load tests, and the native cookie header does not pass through, either:

1. Pass cookies in a custom header and parse them server-side.
2. Use JMeter for advanced cookie/session simulation.

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