Code Explainers

Code explainers tagged #exception-handling

php 
<?php
 
namespace App\Support;
 

Detecting file types by MIME in PHP

file-validation mime-detection whitelist
Intermediate 7 steps
java 
@RestController
@RequestMapping("/api/products")
@Validated
public class ProductSearchController {

Validating query params in a Spring controller

validation pagination rest-api
Intermediate 8 steps
typescript 
import {
  Controller,
  All,
  Req,

Catch-all routes and error shaping in NestJS

exception-handling routing middleware
Intermediate 6 steps
java 
@RestController
@RequestMapping("/api/products")
@RequiredArgsConstructor
public class ProductBatchController {

Batch JSON Merge Patch in Spring

json-merge-patch rest-api partial-update
Intermediate 8 steps
typescript 
import {
  ArgumentsHost,
  Catch,
  ConflictException,

Turning TypeORM lock errors into 409s in NestJS

exception-handling optimistic-locking http-status
Intermediate 6 steps
java 
public class TimedFetchService {
 
    private final ExecutorService executor = Executors.newFixedThreadPool(8);
    private final HttpClient httpClient = HttpClient.newHttpClient();

Enforcing HTTP timeouts with a Future

concurrency timeouts thread-pool
Intermediate 8 steps
java 
package com.example.uploads.config;
 
import jakarta.servlet.MultipartConfigElement;
import org.springframework.boot.web.servlet.MultipartConfigFactory;

Configuring upload size limits in Spring

file-upload exception-handling http-errors
Intermediate 6 steps
python 
from functools import wraps
import asyncio
 
from fastapi import APIRouter, FastAPI, Request

Per-route request timeouts in FastAPI

decorators async timeouts
Intermediate 6 steps
java 
@RestControllerAdvice
public class GlobalExceptionHandler {
 
    private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);

Centralized error handling in Spring

exception-handling problemdetail rest-api
Intermediate 7 steps
java 
@RestController
@RequestMapping("/api/users")
public class UserController {
 

Bean Validation in a Spring REST controller

validation rest-api exception-handling
Intermediate 9 steps
python 
class FileManager:
    """A context manager that safely opens and closes a file."""
 
    def __init__(self, path, mode="r"):

Writing context managers in Python

context-managers resource-management exception-handling
Intermediate 6 steps