XMLHttpRequest Current request is not a multipart request

XMLHttpRequest 是一种 JavaScript 对象，它允许前端网页通过异步方式向服务器发送请求并接收响应。当提到 "Current request is not a multipart request"，这通常表示当前正在进行的 AJAX 请求并不是一个多部分形式的数据发送。多部分请求（Multipart Request）主要用于上传文件或其他二进制数据，因为它会将数据分割成多个部分，并添加头部信息如 `Content-Type` 为 `multipart/form-data`。

如果你尝试发送一个非多部分形式的数据（比如 JSON 或文本字符串），XMLHttpRequest 就不会检测到它是multipart 类型。在这种情况下，你需要确认你的请求头是否设置正确，如果是发送简单数据，通常不需要指定 `multipart/form-data`，而是使用 `application/x-www-form-urlencoded` 或 `text/plain` 格式。

相关问题

ReferenceError: http_request is not defined

This error message usually occurs when you try to use a variable or function that has not been defined or declared. In this case, the error is indicating that the variable `http_request` has not been defined.

To fix this error, you need to make sure that you have defined `http_request` before using it in your code. You can define it using the `var`, `let`, or `const` keywords, depending on your use case.

Here is an example of how you can define `http_request` using the `const` keyword:

const http_request = new XMLHttpRequest();

Make sure to define `http_request` before using it in any other parts of your code.

XMLHttpRequest is not defined

The error message "XMLHttpRequest is not defined" usually occurs in a JavaScript environment where the XMLHttpRequest object is not available. This object is typically used to make HTTP requests and receive responses in web applications.

One possible reason for this error is that the code is running in an environment that does not support XMLHttpRequest, such as in a Node.js environment. In this case, you may need to use a different library or approach to make HTTP requests.

Another possibility is that the code is running in a browser, but the XMLHttpRequest object is not properly initialized. You can check if XMLHttpRequest is available by testing for its existence:

if (window.XMLHttpRequest) {
  // XMLHttpRequest is available
} else {
  // XMLHttpRequest is not available
}

If XMLHttpRequest is not available, you can try using a different approach to make HTTP requests, such as the Fetch API or a third-party library like Axios or jQuery.