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🌀 Middleware и RoundTripper в Go: гибкая обработка HTTP-запросов

В Go нет встроенного понятия "middleware", как в других фреймворках — но вы можете легко реализовать его сами, особенно в контексте http.RoundTripper.

🔧 RoundTripper — это интерфейс, который обрабатывает HTTP-запросы на уровне клиента (`http.Client`). Это даёт возможность внедрять логику *до* и *после* отправки запроса.

🧱 Пример: логгер запросов

type LoggingRoundTripper struct {
rt http.RoundTripper
}

func (l *LoggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
log.Printf("📤 Запрос: %s %s", req.Method, req.URL)
resp, err := l.rt.RoundTrip(req)
if err == nil {
log.Printf("📥 Ответ: %d", resp.StatusCode)
}
return resp, err
}


📦 Использование:

client := &http.Client{
Transport: &LoggingRoundTripper{rt: http.DefaultTransport},
}


💡 Таким образом, вы можете создавать middleware прямо внутри http.Client, например:
• логирование
• кэширование
• модификация заголовков
• retry-логика
• трейсинг

🔗 Подробнее: dev.to/calvinmclean/middleware-and-roundtrippers-in-go-30pa

#golang #httpclient #middleware #webdev #devtools



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🌀 Middleware и RoundTripper в Go: гибкая обработка HTTP-запросов

В Go нет встроенного понятия "middleware", как в других фреймворках — но вы можете легко реализовать его сами, особенно в контексте http.RoundTripper.

🔧 RoundTripper — это интерфейс, который обрабатывает HTTP-запросы на уровне клиента (`http.Client`). Это даёт возможность внедрять логику *до* и *после* отправки запроса.

🧱 Пример: логгер запросов


type LoggingRoundTripper struct {
rt http.RoundTripper
}

func (l *LoggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
log.Printf("📤 Запрос: %s %s", req.Method, req.URL)
resp, err := l.rt.RoundTrip(req)
if err == nil {
log.Printf("📥 Ответ: %d", resp.StatusCode)
}
return resp, err
}


📦 Использование:

client := &http.Client{
Transport: &LoggingRoundTripper{rt: http.DefaultTransport},
}


💡 Таким образом, вы можете создавать middleware прямо внутри http.Client, например:
• логирование
• кэширование
• модификация заголовков
• retry-логика
• трейсинг

🔗 Подробнее: dev.to/calvinmclean/middleware-and-roundtrippers-in-go-30pa

#golang #httpclient #middleware #webdev #devtools

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