APIs Mastery Quiz — Quiz

HTTP semantics, REST design, authentication, FastAPI, pagination and webhooks. · 10 questions

Question 1 of 10

Which status code best fits a successful POST that created a new resource?

a200 OKb201 Createdc204 No Contentd302 Found

Question 2 of 10

Which status code tells a client it is sending too many requests?

a403b409c503d429

Question 3 of 10

Which URL follows REST naming conventions for fetching one order?

aGET /v1/orders/9812bGET /v1/getOrder?id=9812cPOST /v1/orders/get/9812dGET /v1/order_fetch/9812

Question 4 of 10

What are the three dot-separated parts of a JWT?

akey.value.checksumbuser.role.expirycheader.payload.signaturediss.sub.aud

Question 5 of 10

Which HTTP method is NOT idempotent by definition?

aPUTbDELETEcGETdPOST

Question 6 of 10

A logged-in user requests an admin-only endpoint. Which status code is correct?

a401 Unauthorizedb403 Forbiddenc404 Not Foundd400 Bad Request

Question 7 of 10

What does FastAPI return if this endpoint receives `{"qty": "abc"}`?

class Item(BaseModel):
    qty: int

@app.post('/items')
def add(item: Item):
    return item

a500 Internal Server Errorb200 with qty set to 0c422 with details of the validation errord400 with an empty body

Question 8 of 10

Which OAuth2 flow suits a backend service calling another API with no user involved?

aClient CredentialsbAuthorization Code with PKCEcImplicitdResource Owner Password

Question 9 of 10

Why is cursor (keyset) pagination preferred over large offsets on big tables?

aCursors allow jumping to any page numberbOffsets are not supported by SQLcCursors are easier to implement in the clientd`WHERE id > last_id` uses an index, while big OFFSETs scan and discard many rows

Question 10 of 10

Why does this webhook check use `hmac.compare_digest` instead of `==`?

expected = hmac.new(secret, body, hashlib.sha256).hexdigest()
ok = hmac.compare_digest(expected, received)

aIt is faster than ==bIt compares in constant time, preventing timing attackscIt also decodes Base64d== cannot compare hex strings