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【Q116】http 服务中静态文件的 Last-Modified 是根据什么生成的 #117

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shfshanyue opened this issue Dec 10, 2019 · 2 comments
Open

【Q116】http 服务中静态文件的 Last-Modified 是根据什么生成的 #117

shfshanyue opened this issue Dec 10, 2019 · 2 comments
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@shfshanyue
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@shfshanyue
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shfshanyue commented Dec 10, 2019 •
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一般会选文件的 mtime，表示文件内容的修改时间

nginx 也是这样处理的，源码见: ngx_http_static_module.c

    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length_n = of.size;
    r->headers_out.last_modified_time = of.mtime;

关于为什么使用 mtime 而非 ctime，可以参考 #116

@feefeefee
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针对静态资源而言，一般会选择文件的 mtime 元属性作为上次修改时间，该元属性表示文件内容的修改时间，在linux中可以用stat命令来查看文件属性，其中就包括了mtime和ctime。mtime指的是文件内容修改时间，而ctime指的是文件修改时间

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@shfshanyue @feefeefee