Why Do Successive Golang HTTP Requests Result in Unexpected EOF Errors?

Unexpected EOF Errors in Golang HTTP Requests during Successive Calls

In an attempt to resolve unusual errors encountered while using the standard net/http package, a user reported intermittent EOF (End of File) exceptions when making multiple HTTP requests successively.

The code snippet provided by the user includes test functions for GET and PUT requests, where errors sporadically occurred during execution.

Troubleshooting the Issue

After analyzing the code, it was discovered that the underlying cause was related to improper request handling. Specifically, the Req.Close field was not explicitly set to true.

In the provided code, the defer resp.Body.Close() syntax was used to handle the response body closing. However, this proved insufficient, and setting Req.Close to true was necessary to ensure proper request handling.

Updated Code

The following code snippet demonstrates how to correctly set Req.Close:

client := &http.Client{}
req, err := http.NewRequest(method, url, httpBody)

// **NOTE** this !!
req.Close = true

req.Header.Set("Content-Type", "application/json")
req.SetBasicAuth("user", "pass")
resp, err := client.Do(req)
if err != nil {
    // whatever
}
defer resp.Body.Close()

response, err = ioutil.ReadAll(resp.Body)
if err != nil {
    // Whatever
}

Resolution

Setting Req.Close to true effectively guarantees that the HTTP request closes correctly, preventing the EOF error from occurring. By implementing this change, the user's test functions consistently passed when making multiple requests, resolving the issue.

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