Why Am I Getting an 'invalid character' Error When Unmarshaling JSON in Golang?

Invalid Character Error in Golang JSON Unmarshaling

When attempting to post JSON with an XML message embedded, a common error encountered is: "invalid character 'b' looking for beginning of value". This typically occurs when the JSON response returned by the server is not in the correct format.

One possible cause for this error is attempting to unmarshal a response body that is not in JSON format. In the provided code snippet, the error occurs at the line:

return json.Unmarshal(resBody, v)

To debug this issue, consider adding the following code:

err := json.Unmarshal(resBody, v)
if err != nil {
    log.Printf("error decoding sakura response: %v", err)
    if e, ok := err.(*json.SyntaxError); ok {
        log.Printf("syntax error at byte offset %d", e.Offset)
    }
    log.Printf("sakura response: %q", resBody)
    return err
}

This modified code will log the detailed error message and the response body, allowing you to identify the specific cause of the invalid character error. By examining the error offset and the response body, you can determine if the error is due to an invalid JSON structure or a problem with the server's response.

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