Django 获取 Content-Range 请求头：META 字典机制解析

Django 请求头存储机制

在 Django 框架中，客户端发送的 HTTP 请求头信息会被统一处理，其键名会转换为大写形式，并添加 HTTP_ 前缀后存储到 request.META 字典中。

因此，要获取特定的请求头，只需按照上述命名规则访问对应的字典键即可。

content_range = request.META['HTTP_CONTENT_RANGE']

这样即可成功获取到 Content-Range 的信息。

官方文档对 META 字典的说明

Django 官方文档对此机制的解释如下：

A standard Python dictionary containing all available HTTP headers. Available headers depend on the client and server, but here are some examples:

CONTENT_LENGTH – The length of the request body (as a string). CONTENT_TYPE – The MIME type of the request body. HTTP_ACCEPT – Acceptable content types for the response. HTTP_ACCEPT_ENCODING – Acceptable encodings for the response. HTTP_ACCEPT_LANGUAGE – Acceptable languages for the response. HTTP_HOST – The HTTP Host header sent by the client. HTTP_REFERER – The referring page, if any. HTTP_USER_AGENT – The client's user-agent string. QUERY_STRING – The query string, as a single (unparsed) string. REMOTE_ADDR – The IP address of the client. REMOTE_HOST – The hostname of the client. REMOTE_USER – The user authenticated by the Web server, if any. REQUEST_METHOD – A string such as "GET" or "POST". SERVER_NAME – The hostname of the server. SERVER_PORT – The port of the server (as a string). With the exception of CONTENT_LENGTH and CONTENT_TYPE, as given above, any HTTP headers in the request are converted to META keys by converting all characters to uppercase, replacing any hyphens with underscores and adding an HTTP_ prefix to the name. So, for example, a header called X-Bender would be mapped to the META key HTTP_X_BENDER.

常见误区与文档阅读建议

许多开发者在查找 Content-Range 时，因未在官方文档的示例列表中找到该字段，便误以为 Django 不支持此功能，从而耗费大量时间通过百度或 Google 搜索解决方案。

实际上，官方文档仅列举了部分常见请求头作为示例，并未穷尽所有情况。关键在于仔细阅读文档开头提到的“A standard Python dictionary containing all available HTTP headers”（包含所有可用 HTTP 头的标准 Python 字典）。只要理解这一机制，就能明白 Content-Range 同样遵循大写及前缀转换规则，阅读文档时需更加细致。

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