HTTP Status Code Flashcards: Meanings, Classes & Use Cases

Question 1

What is the purpose of the 1xx HTTP status-code class?

Accepted Answer

Informational. A 1xx response is interim: it communicates connection status or request progress before the final response.

Question 2

What is the purpose of the 2xx HTTP status-code class?

Accepted Answer

Successful. A 2xx response means the request was successfully received, understood, and accepted.

Question 3

What is the purpose of the 3xx HTTP status-code class?

Accepted Answer

Redirection. A 3xx response means the user agent needs to take further action to fulfill the request, such as following another URI or using a cached representation.

Question 4

What is the purpose of the 4xx HTTP status-code class?

Accepted Answer

Client Error. A 4xx response means the client appears to have made an error; it does not prove that every fault lies in client code.

Question 5

What is the purpose of the 5xx HTTP status-code class?

Accepted Answer

Server Error. A 5xx response means the server knows it has erred or cannot perform the requested method.

Question 6

What does HTTP status code 200 mean?

Accepted Answer

OK. The request succeeded; the meaning of any response content depends on the request method.

Question 7

What does HTTP status code 404 mean?

Accepted Answer

Not Found. The origin server has no current representation for the target resource, or it is unwilling to disclose that one exists. The code does not say whether the condition is temporary or permanent.

Question 8

What does HTTP status code 301 mean?

Accepted Answer

Moved Permanently. The target resource has a new permanent URI. For historical reasons, a user agent may change POST to GET when following it; use 308 when method preservation matters.

Question 9

What does HTTP status code 500 mean?

Accepted Answer

Internal Server Error. The server hit an unexpected condition that prevented it from fulfilling the request.

Question 10

What does HTTP status code 201 mean?

Accepted Answer

Created. The request was fulfilled and created one or more resources. The primary resource is identified by Location, or by the target URI when Location is absent.

Question 11

What does HTTP status code 401 mean?

Accepted Answer

Unauthorized. The request was not applied because it lacks valid authentication credentials for the target resource. The response includes a WWW-Authenticate challenge.

Question 12

What does HTTP status code 503 mean?

Accepted Answer

Service Unavailable. The server is temporarily unable to handle the request, often because of overload or maintenance. It may send Retry-After.

Question 13

What does HTTP status code 204 mean?

Accepted Answer

No Content. The server successfully fulfilled the request and has no additional response content to send.

Question 14

What does HTTP status code 403 mean?

Accepted Answer

Forbidden. The server understood the request but refuses to fulfill it. Credentials may be insufficient, or the refusal may be unrelated to authentication.

Question 15

What does HTTP status code 302 mean?

Accepted Answer

Found. The target resource is temporarily available at another URI, so future requests should still use the original URI. A user agent may change POST to GET when following it.

Question 16

What does HTTP status code 400 mean?

Accepted Answer

Bad Request. The server cannot or will not process the request because of a perceived client error, such as malformed syntax, invalid framing, or deceptive routing.

Question 17

What does HTTP status code 502 mean?

Accepted Answer

Bad Gateway. A server acting as a gateway or proxy received an invalid response from an inbound server while trying to fulfill the request.

Question 18

Which HTTP status code has the registered reason phrase “OK”?

Accepted Answer

200 OK. It indicates that the request succeeded.

Question 19

What does HTTP status code 202 mean?

Accepted Answer

Accepted. The request was accepted for processing, but processing is incomplete and might not ultimately happen.

Question 20

Which HTTP status code has the registered reason phrase “Not Found”?

Accepted Answer

404 Not Found. It means there is no current representation for the target resource, or the server will not disclose one.

Question 21

What does HTTP status code 304 mean?

Accepted Answer

Not Modified. A conditional GET or HEAD would otherwise have returned 200, but the condition was false, so the client can use its stored representation. A 304 response has no content.

Question 22

Which HTTP status code has the registered reason phrase “Created”?

Accepted Answer

201 Created. It means the fulfilled request created one or more resources.

Question 23

Which HTTP status code means the request lacks valid authentication credentials?

Accepted Answer

401 Unauthorized. The response challenges the client to authenticate for the target resource.

Question 24

Which HTTP status code has the registered reason phrase “Internal Server Error”?

Accepted Answer

500 Internal Server Error. It covers an unexpected server condition that prevented fulfillment.

Question 25

Which HTTP status code means success with no additional response content?

Accepted Answer

204 No Content. The action succeeded, and there is no response content to send.

Question 26

Which HTTP status code means the server understood the request but refuses to fulfill it?

Accepted Answer

403 Forbidden. Repeating the same request with the same credentials should not be automatic.

Question 27

Which HTTP status code has the registered reason phrase “Moved Permanently”?

Accepted Answer

301 Moved Permanently. Future references should use the new permanent URI.

Question 28

Which HTTP status code means the server is temporarily unable to handle the request?

Accepted Answer

503 Service Unavailable. Temporary overload or maintenance are typical reasons.

Question 29

Which HTTP status code has the registered reason phrase “Bad Request”?

Accepted Answer

400 Bad Request. The server perceives a client-side problem that prevents or discourages processing.

Question 30

Which HTTP status code means a gateway or proxy received an invalid inbound response?

Accepted Answer

502 Bad Gateway. The upstream response arrived, but it was invalid.

Question 31

Which HTTP status code has the registered reason phrase “Accepted”?

Accepted Answer

202 Accepted. Processing has been accepted but is not complete.

Question 32

Which HTTP status code tells a conditional GET or HEAD to use a stored representation?

Accepted Answer

304 Not Modified. The request condition evaluated false, so the stored representation remains valid for this response.

Question 33

What does HTTP status code 100 mean?

Accepted Answer

Continue. The server received the initial part of the request and has not rejected it. With Expect: 100-continue, the client should continue sending the request content.

Question 34

What does HTTP status code 206 mean?

Accepted Answer

Partial Content. The server is successfully fulfilling a range request by transferring one or more parts of the selected representation.

Question 35

What does HTTP status code 307 mean?

Accepted Answer

Temporary Redirect. The resource is temporarily at another URI, and an automatic redirect must preserve the request method.

Question 36

What does HTTP status code 409 mean?

Accepted Answer

Conflict. The request cannot be completed because it conflicts with the target resource’s current state. The client may be able to resolve the conflict and resubmit.

Question 37

What does HTTP status code 504 mean?

Accepted Answer

Gateway Timeout. A gateway or proxy did not receive a timely response from an upstream server needed to complete the request.

Question 38

What does HTTP status code 101 mean?

Accepted Answer

Switching Protocols. The server accepts the client’s Upgrade request and names the protocol that will be used after this response.

Question 39

Which HTTP status code means a range request succeeded with only part of the representation?

Accepted Answer

206 Partial Content. The response carries one or more requested ranges.

Question 40

Which temporary redirect status code requires method preservation?

Accepted Answer

307 Temporary Redirect. An automatic redirect must not change the request method.

Question 41

Which HTTP status code means a request conflicts with the target resource’s current state?

Accepted Answer

409 Conflict. The client may be able to resolve the state conflict and try again.

Question 42

Which HTTP status code means a gateway timed out waiting for an upstream server?

Accepted Answer

504 Gateway Timeout. The upstream response did not arrive in time.

Question 43

What does HTTP status code 102 mean?

Accepted Answer

Processing. This registered interim response says the server accepted the complete request but has not finished processing it; a final response still follows.

Question 44

What does HTTP status code 203 mean?

Accepted Answer

Non-Authoritative Information. The request succeeded, but a transforming proxy modified the enclosed content from the origin server’s 200 response.

Question 45

What does HTTP status code 308 mean?

Accepted Answer

Permanent Redirect. The resource has a new permanent URI, and an automatic redirect must preserve the request method.

Question 46

What does HTTP status code 410 mean?

Accepted Answer

Gone. Access to the target resource is no longer available at the origin server, and the condition is likely permanent.

Question 47

What does HTTP status code 501 mean?

Accepted Answer

Not Implemented. The server does not support functionality required to fulfill the request, such as an unrecognized method it cannot support for any resource.

Question 48

What does HTTP status code 103 mean?

Accepted Answer

Early Hints. This interim response carries header fields the server is likely to include in the final response, letting the client make safe performance optimizations while it waits.

Question 49

What does HTTP status code 205 mean?

Accepted Answer

Reset Content. The request succeeded, and the server wants the user agent to reset the document view that caused the request. The response has no content.

Question 50

Which permanent redirect status code requires method preservation?

Accepted Answer

308 Permanent Redirect. Future requests should use the new URI without changing the method during automatic redirection.

Question 51

Which HTTP status code says a resource is no longer available and is likely gone permanently?

Accepted Answer

410 Gone. Use 404 when the server does not know whether the absence is permanent.

Question 52

Which HTTP status code means the required server functionality is unsupported?

Accepted Answer

501 Not Implemented. It applies when the server cannot support the functionality needed to fulfill the request.

Question 53

What does HTTP status code 207 mean?

Accepted Answer

Multi-Status. The response reports status for multiple independent operations, as defined for WebDAV.

Question 54

What does HTTP status code 300 mean?

Accepted Answer

Multiple Choices. The target has more than one representation, and the response provides alternatives so the user or user agent can choose.

Question 55

What does HTTP status code 405 mean?

Accepted Answer

Method Not Allowed. The origin server knows the request method, but the target resource does not support it. The response includes an Allow field.

Question 56

What does HTTP status code 505 mean?

Accepted Answer

HTTP Version Not Supported. The server does not support, or refuses to support, the major HTTP version used in the request.

Question 57

What does HTTP status code 208 mean?

Accepted Answer

Already Reported. Inside a WebDAV multistatus response, it avoids repeatedly enumerating descendants of another binding to the same collection.

Question 58

What does HTTP status code 303 mean?

Accepted Answer

See Other. The Location URI identifies a different resource that can provide an indirect response; the user agent retrieves it with GET or HEAD.

Question 59

What does HTTP status code 406 mean?

Accepted Answer

Not Acceptable. The target has no current representation acceptable under the request’s proactive negotiation fields, and the server will not send a default.

Question 60

What does HTTP status code 506 mean?

Accepted Answer

Variant Also Negotiates. The server has a transparent content-negotiation configuration error: the chosen variant is itself configured to negotiate.

Question 61

What does HTTP status code 226 mean?

Accepted Answer

IM Used. The server fulfilled a GET by returning the result of one or more instance manipulations applied to the current representation, identified in the IM response field.

Question 62

What does HTTP status code 305 mean?

Accepted Answer

Use Proxy — deprecated. It was defined to direct access through a proxy, but RFC 9110 marks the status code deprecated. New implementations should not rely on it.

Question 63

What does HTTP status code 407 mean?

Accepted Answer

Proxy Authentication Required. The client must authenticate to a proxy for this request. The proxy sends a Proxy-Authenticate challenge.

Question 64

What does HTTP status code 507 mean?

Accepted Answer

Insufficient Storage. The server cannot store the representation needed to complete the method. WebDAV defines this as a temporary condition.

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