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开源软件介绍：

koa-better-error-handler

A better error-handler for Lad and Koa. Makes ctx.throw awesome (best used with koa-404-handler)

Index

• Features
• Install
• Usage
  • API
  • Web App
• User-Friendly Responses
• HTML Error Lists
• License

Features

• Detects Node.js DNS errors (e.g. ETIMEOUT and EBADFAMILY) and sends 408 Client Timeout error
• Detects Redis errors (e.g. ioredis' MaxRetriesPerRequestError) and sends 408 Client Timeout error
• Uses Boom for making error messages beautiful (see User Friendly Responses below)
• Simply a better error handler (doesn't remove all headers like the built-in one does)
• Doesn't make all status codes 500 (like the built-in Koa error handler does)
• Supports Flash messages and preservation of newly set session object
• Fixes annoying redirect issue where flash messages were lost upon an error being thrown
• Supports HTML Error Lists using <ul> for Mongoose validation errors with more than one message
• Makes ctx.throw beautiful messages (e.g. ctx.throw(404) will output a beautiful error object