the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null

这个错误通常是因为请求中缺少正确的 `Content-Type` 头。`Content-Type` 头用于指示请求中包含的数据类型，例如 `application/json` 或 `multipart/form-data`。

如果你正在尝试上传文件或表单数据，你需要确保请求的 `Content-Type` 头设置为 `multipart/form-data` 或 `multipart/mixed`。如果你正在发送 JSON 数据，那么 `Content-Type` 应该设置为 `application/json`。

如果你使用的是某个库或框架发起请求，那么这个库或框架通常会自动设置正确的 `Content-Type` 头。否则，你需要手动设置请求头。例如，使用 JavaScript 发起请求时，可以使用以下代码设置 `Content-Type` 头：

xhr.setRequestHeader('Content-Type', 'application/json');

相关问题

报错the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is application/x-www-form-urlencoded

这个错误通常是因为你的请求没有按照正确的格式发送。这个错误的含义是请求的Content-Type不是multipart/form-data或multipart/mixed。而是application/x-www-form-urlencoded。

你需要检查你发送的请求的Content-Type是否正确。如果你想发送文件或者其他二进制数据，你需要使用multipart/form-data格式。如果你只是发送普通的表单数据，你可以使用application/x-www-form-urlencoded格式。

如果你使用的是Postman等API测试工具，你需要在Body选项卡中选择正确的格式。如果你使用的是代码发送请求，你需要设置请求头Content-Type为multipart/form-data或multipart/mixed。

and content type [application/octet-stream]

The content type application/octet-stream is a binary format used for transferring unstructured data over the internet. It is used for a variety of purposes, including sending software updates, multimedia files, and other types of data that do not fit into a specific content type.

When a server sends data with the content type application/octet-stream, it is indicating that the data is binary and should not be interpreted as text. This means that the data may contain any combination of characters, including control characters, null bytes, and other non-printable characters.

To process data with the content type application/octet-stream, specialized software may be required to interpret the binary data and extract meaningful information from it. This can include software libraries, APIs, or custom code that is designed to handle specific types of binary data.