Network Assertions - LambdaTest

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Network assertions let you verify HTTP traffic: API responses, status codes, headers, response bodies, and request timing.

How Capture Works

KaneAI captures all HTTP network traffic automatically during each test step:

Continuous capture: Every HTTP request and response is recorded as it happens
Per-step scope: Each test step starts with a fresh capture. Traffic from previous steps is not carried over
Limits: Up to 5,000 requests are stored per step. When the limit is reached, the oldest 10% of entries are dropped to make room. Response bodies are capped at 64KB per entry
Text bodies only: Response bodies are captured for text-based content types (JSON, HTML, XML, CSS, JavaScript). Binary content (images, fonts, videos) is skipped
Multi-tab support: Traffic from new tabs and popups is also captured

Planning for Multi-Step Tests

Because network data resets each step, plan accordingly:

If you need to assert on an API response later, extract and store it in the same step the request happens
Navigation and API calls in step 1 won’t be visible in step 3’s network log
Use extraction checkpoints to save values across steps

What You Can Query

Field	Type	Description
`method`	string	HTTP method (GET, POST, PUT, DELETE, …)
`url`	string	Full request URL
`domain`	string	Domain (e.g., “api.example.com”)
`path`	string	URL path without query string
`query_params`	dict	Query parameters
`resource_type`	string	xhr, fetch, document, script, image, …
`request_headers`	dict	Request headers
`request_body`	string	Request body (may be truncated)
`response_status`	int	HTTP status code (200, 404, 500, …)
`response_headers`	dict	Response headers
`response_body`	string	Response body (text types only, may be truncated)
`timing.duration_ms`	float	Total request duration in milliseconds
`timing.ttfb_ms`	float	Time to first byte in milliseconds
`failed`	bool	True if request failed at network level
`failure_reason`	string	Error reason (e.g., “net::ERR_CONNECTION_REFUSED”)

Example Assertions

Assert: no API calls returned 5xx status codes
Assert: the POST /api/login returned HTTP status 200
Assert: all API responses completed in under 2 seconds
Assert: no network requests failed with connection errors
Assert: the /posts endpoint returned at least 10 items in the response body

Example Extractions

Store the response body of the POST /api/login request
Extract the status code of the last API call to /api/users
Store all API request URLs

Example If/Else

If the /api/auth returned 200 then proceed to dashboard, else show error message

​How Capture Works

​Planning for Multi-Step Tests

​What You Can Query

​Example Assertions

​Example Extractions

​Example If/Else