错误的MIME“内容类型"的http.FileServer响应； [英] http.FileServer response with wrong mime "Content-Type"

问题描述

我正在使用http.FileServer来提供mp3文件的目录，该模板然后是javascript中的src.但是，该响应使用Content-Type text/html而不是audio/mpeg.我如何设置FileServer响应的mime类型，我看到了这个问题

我得到的错误是:

HTTP "Content-Type" of "text/html" is not supported. Load of media resource http://localhost:5177/media/sample1.mp3 failed.

解决方案

这不是内容类型的问题.当您请求mp3时，不会调用您的fs处理程序.您需要将/添加到图案/media中，并添加带状前缀这样的

http.Handle("/media/", http.StripPrefix("/media/", fs))

原因在 net/http.ServeMux

的文档中>

模式名称固定，有根的路径(例如"/favicon.ico")或有根的子树， 像"/images/"(注意斜杠).较长的模式优先 超过较短的那些，这样，如果同时注册了两个处理程序 "/images/"和"/images/thumbnails/"，将要求使用后者 以"/images/thumbnails/"开头的路径，前者将收到请求 用于"/images/"子树中的任何其他路径.

仅使用/media即可注册路径的处理程序，但是带有斜杠的斜杠会将其视为rooted subtree并将在该树下处理请求.

I'm using http.FileServer to serve a directory of mp3 files, which my template then src in javascript. The response, however, uses the Content-Type text/html instead of audio/mpeg. How do I set the mime type which the FileServer responds with, I saw this question Setting the 'charset' property on the Content-Type header in the golang HTTP FileServer , but I'm still not sure how to override the mime type.

My code looks like the following:

fs := http.FileServer(http.Dir(dir))
http.Handle("/media", http.StripPrefix("/media", fs))
http.HandleFunc("/", p.playlistHandler)
http.ListenAndServe(":5177", nil)

and the error I get is:

HTTP "Content-Type" of "text/html" is not supported. Load of media resource http://localhost:5177/media/sample1.mp3 failed.

解决方案

It's not a problem of content types. Your fs handler isn't getting called when you request the mp3. You need to add a / to your pattern /media and the strip prefix like this

http.Handle("/media/", http.StripPrefix("/media/", fs))

The reason is in the documentation of net/http.ServeMux

Patterns name fixed, rooted paths, like "/favicon.ico", or rooted subtrees, like "/images/" (note the trailing slash). Longer patterns take precedence over shorter ones, so that if there are handlers registered for both "/images/" and "/images/thumbnails/", the latter handler will be called for paths beginning "/images/thumbnails/" and the former will receive requests for any other paths in the "/images/" subtree.

With just /media you're registering a handler for a path but with a trailing slash it considers it a rooted subtree and will serve requests under that tree.

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