browsers only considers your data as HTML, because your header says that 'content-type: text/html', if it has said 'text/plain' then this new line will be interpreted as it is (but other html tags won't work), if you want to insert a newline when the content type is 'text/html' use
<br> or <p> tags.
Vivek
-- In accordance with the prarabdha of each, the One whose function it is to ordain makes each to act. What will not happen will never happen, whatever effort one may put forth. And what will happen will not fail to happen, however much one may seek to prevent it. This is certain. The part of wisdom therefore is to stay quiet.