feat: add precise diagnostics and optional client copy logging controls

httpc/json.go

@@ -11,7 +11,7 @@ import (
 )
 
 // JSON bounds response memory, closes the body, and decodes only 2xx responses.
-// Optional headers/limits belong to this call and never alter the client.
+// Optional headers/limits/success statuses belong to this call and never alter the client.
 // output=nil discards a bounded stream; it does not buffer or validate JSON.
 // Empty successful bodies leave output unchanged. StatusError contains no body.
 func (c *Client) JSON(ctx context.Context, method, url string, input, output any, options ...RequestOption) error {
@@ -57,7 +57,7 @@ func (c *Client) JSON(ctx context.Context, method, url string, input, output any
 		return err
 	}
 	defer response.Body.Close()
-	if response.StatusCode < 200 || response.StatusCode >= 300 {
+	if !settings.accepts(response.StatusCode) {
 		drainStatusBody(response, settings.maxResponseBytes)
 		return &StatusError{StatusCode: response.StatusCode}
 	}