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Bypass "Invalid Request" errors by fetching and injecting fresh security tokens before every POST.
Steps:
- Initial Handshake: Send a
GET
request to the landing page to receive the initial session cookies.
- Token Extraction: Use an
LR
block to find the hidden input field:
name="_csrf" value="([^"]*)"
.
- Buffer Injection: Pass that variable into the body of your
POST
request.
- Validation: Check if the token expires; some sites require a fresh token for the login and a separate one for the account dashboard.









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