What does ValidateAntiForgeryToken do?
PICTURE THIS: A SENTENCE BECOMES TOKENS
The model does not read letters like humans. It reads these pieces, then predicts the next one.
Simple meaning
It blocks CSRF on POST by matching a hidden token with a cookie.
WHY — Security instead of guessing?
Why interviewers care about Security:
who only read docs from people who shipped.
and tied to .NET MVC work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens with tokens?
Before the model can read a sentence, it goes through these steps:
- 1It blocks CSRF on
POST by matching a hidden token with a cookie.
- 2I put it on
state-changing actions.
- 3Embeddings
APIs often use other tokens
- 4MVC form posts should
keep anti-forgery.
- 5Next token
The model scores what should come next.
- 6Decode
IDs turn back into readable text.
EXAMPLE — See it in action
Let's see how a real sentence is tokenized (tokens may vary by model):
Note: Actual tokens and IDs depend on the tokenizer (e.g., GPT, Llama, etc.).
Key takeaway
It blocks CSRF on POST by matching a hidden token with a cookie. I put it on state-changing actions.