The request message was already sent. cannot send the same request message multiple times.

When receiving the error message “The request message was already sent. Cannot send the same request message multiple times,” it means that the request being made has already been sent once and cannot be sent again without some modifications or changes. This error usually occurs when attempting to send duplicate requests to a server or API endpoint.

To better understand this issue, let’s take an example:

    // Example AJAX request using JavaScript and jQuery
    $.ajax({
      url: "https://api.example.com/data",
      method: "GET",
      success: function(response) {      
        console.log(response);
      },
      error: function(xhr, status, error) {        
        console.error(error);
      }
    });
    
    // Sending the same request again immediately
    $.ajax({
      url: "https://api.example.com/data",
      method: "GET",
      success: function(response) {      
        console.log(response);
      },
      error: function(xhr, status, error) {        
        console.error(error);
      }
    });
  

In the above JavaScript code snippet, we are making an AJAX request to the “https://api.example.com/data” endpoint using jQuery’s AJAX method. However, immediately after the first request, we are attempting to send the exact same request again without any modifications. This will result in the error message mentioned.

To resolve this issue, you have a few options:

1. Check if the request has already been sent and avoid sending duplicate requests if not necessary.
2. If the duplicate request is intentional, you can modify the request in some way to differentiate it from the previous one. This can include adding query parameters, changing request headers, or modifying the request body.
3. Use a different API endpoint or server-side implementation that allows for sending multiple identical requests without encountering this error.