python3 http.server中wasm的mime类型配置

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使用WebAssembly.instantiateStreaming(fetch(‘add.wasm’), imports)以流方式获取wasmw文件时,chrome会抱怨:

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Uncaught (in promise) TypeError: Failed to execute 'compile' on 'WebAssembly': 
Incorrect response MIME type. Expected 'application/wasm'.

查看server.py发现使用了mimetypes模块来管理mime types，调用mimetypes.init()方法时，会使用mimetypes.knownfiles文件中记载的mime types

查看knowfiles路径：

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$ python3
>>> import mimetypes
>>> mimetypes.knownfiles
\['/etc/mime.types', '/etc/httpd/mime.types', 
'/etc/httpd/conf/mime.types', '/etc/apache/mime.types', 
'/etc/apache2/mime.types', 
'/usr/local/etc/httpd/conf/mime.types', 
'/usr/local/lib/netscape/mime.types', 
'/usr/local/etc/httpd/conf/mime.types', 
'/usr/local/etc/mime.types'\]

MacOS上这些文件基本都不存在，添加文件/usr/local/etc/mime.types，其内容添加如下行：

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application/wasm wasm

重新启动http.server就好了，注意清除浏览器缓存再试。