HTTP Status Codes

Example

A quick reference written as a Java switch expression, using ShopEase situations:

public class Main {
    static String describe(int code) {
        return switch (code / 100) {
            case 2 -> "success";
            case 3 -> "redirect";
            case 4 -> "client error";
            case 5 -> "server error";
            default -> "informational";
        };
    }

    public static void main(String[] args) {
        int[][] cases = { {200}, {201}, {204}, {400}, {401}, {403}, {404}, {409}, {500} };
        String[] situations = {
            "GET /api/products returned the list",
            "POST /api/orders created a new order",
            "DELETE /api/cart/7 removed the item",
            "price was negative in the request body",
            "no login token sent",
            "a CUSTOMER tried to delete a product",
            "product 999 does not exist",
            "email already registered",
            "database is down" };
        for (int i = 0; i < cases.length; i++) {
            int code = cases[i][0];
            System.out.printf("%d %-13s <- %s%n", code, describe(code), situations[i]);
        }
    }
}

Output

200 success       <- GET /api/products returned the list
201 success       <- POST /api/orders created a new order
204 success       <- DELETE /api/cart/7 removed the item
400 client error  <- price was negative in the request body
401 client error  <- no login token sent
403 client error  <- a CUSTOMER tried to delete a product
404 client error  <- product 999 does not exist
409 client error  <- email already registered
500 server error  <- database is down