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How Can I Prematurely Close Go HTTP Client POST Requests?

Mary-Kate Olsen

Nov 29, 2024 am 09:01 AM

How Can I Prematurely Close Go HTTP Client POST Requests?

Premature Closure of Go HTTP Client POST Requests

When working with HTTP long-polls using the http.Client, it may be necessary to terminate the request prematurely from the client-side. Historically, resp.Body.Close() could be used, but it required a separate goroutine to execute.

Current Solution: Context-based Cancellation

To resolve this issue, Go now recommends using http.Request.WithContext to pass a context with a deadline or cancelation mechanism. This eliminates the need for an additional goroutine and provides a cleaner, standardized approach.

Example

req, err := http.NewRequest("GET", "http://example.com", nil)
req = req.WithContext(ctx) // Pass the context with deadline or cancelation mechanism
resp, err := client.Do(req)

This approach provides greater control over request cancellation, allowing it to be triggered based on user actions or other application logic, not just timeouts.

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