Flask Web Development

11.

Error Handling and Logging

11.1.

Error Handling Fundamentals

11.1.1.

Types of Errors

11.1.1.1.

11.1.1.2.

11.1.1.3.

11.1.2.

Error Propagation

11.1.3.

Graceful Error Handling

11.2.

HTTP Error Responses

11.2.1.

Common HTTP Error Codes

11.2.1.1.

400 Bad Request

11.2.1.2.

401 Unauthorized

11.2.1.3.

11.2.1.4.

11.2.1.5.

405 Method Not Allowed

11.2.1.6.

500 Internal Server Error

11.2.2.

Flask's Default Error Pages

11.2.3.

Error Response Formats

11.3.

Custom Error Handlers

11.3.1.

@app.errorhandler Decorator

11.3.2.

Error Handler Functions

11.3.3.

Error-Specific Handlers

11.3.4.

Generic Error Handlers

11.3.5.

Blueprint Error Handlers

11.3.6.

11.4.

Exception Handling

11.4.1.

Try-Catch Blocks

11.4.2.

Custom Exceptions

11.4.3.

Exception Logging

11.4.4.

Exception Propagation

11.5.

Logging in Flask

11.5.1.

Python Logging Module

11.5.2.

Flask Logging Configuration

11.5.3.

11.5.3.1.

11.5.3.2.

11.5.3.3.

11.5.3.4.

11.5.3.5.

11.5.4.

Logging Formatters

11.5.5.

Logging Handlers

11.5.5.1.

Console Handler

11.5.5.2.

11.5.5.3.

Rotating File Handler

11.5.5.4.

11.5.6.

Structured Logging

11.5.7.

Contextual Logging

11.6.

Production Error Handling

11.6.1.

Error Monitoring

11.6.2.

Error Reporting Services

11.6.3.

Log Aggregation

11.6.4.

Performance Monitoring

11.6.5.

Alerting Systems

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12. Testing Flask Applications