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

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.

CMake Error: The source directory "/home/uav-control" does not appear to contain CMakeLists.txt

这个错误提示说明你在运行 CMake 命令的时候指定的目录下没有包含 CMakeLists.txt 文件，因为 CMakeLists.txt 文件是 CMake 构建系统的配置文件，没有它 CMake 就无法进行构建。

你需要确保你正在运行 CMake 的目录下包含 CMakeLists.txt 文件，或者在运行 CMake 命令时指定正确的目录。例如，如果你的 CMakeLists.txt 文件在 /home/uav-control/src 目录下，你可以使用以下命令运行 CMake：

cd /home/uav-control
mkdir build
cd build
cmake ../src

这将在 /home/uav-control/build 目录下生成 Makefile 文件，你可以使用 make 命令进行编译和构建。