内容长度和其他 HTTP 标头?
如果我在生成普通 HTML 页面时设置此标头是否会给我带来任何好处?
Does it give me any advantage if I set this header when generating normal HTML pages?
我看到一些框架会设置这个头属性，我想知道为什么......(以及其他标题，例如 Content-Type: text/html)
I see that some frameworks out there will set this header property and I was wondering why...
(Along with other headers, like Content-Type: text/html)
浏览器加载网站是否更快或更流畅?
Does browser load the site faster or smoother?
ps:他们这样做:
ob_start();
... stuff here...
$content = ob_get_contents();
$length = strlen($content);
header('Content-Length: '.$length);
echo $content;
推荐答案
我认为这只是因为 HTTP 规范要求在所有可能的情况下都这样做.
I think its only because of the HTTP Spec says to do this in every case possible.
应用程序应该使用这个字段来指示消息体的传输长度，除非这被第 4.4 节中的规则禁止.
Applications SHOULD use this field to indicate the transfer-length of the message-body, unless this is prohibited by the rules in section 4.4.
您还可以查看 在 Pauls Answer 上Deaomon的问题.
我想这也会回答你的问题.
I think this will answer yours too.
如果您希望某人下载带有另一个标题的文件，您还应该使用 Content-Length:例如
Also you should use Content-Length if you want someone download a file with another header: e.g.
<?php
$file = "original.pdf"
$size = filesize($file);
header('Content-type: application/pdf');
header("Content-length: $size");
header('Content-Disposition: attachment; filename="downloaded.pdf"');
readfile($file);
?>
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