Regarding the headers already sent problem when using the post method

I recently used Baidu Voice to deploy on Sina Cloud. I found that the following error would occur when using the post method. It can be successful using the get method:

<code>Warning: Cannot modify header information - headers already sent <span>by</span> (output started <span>at</span>                           /data1/www/htdocs/<span>480</span>/androidmysql/<span>3</span>/tts.php:<span>9</span>) <span>in</span> tts.php <span><span>on</span><span>line</span><span>10</span></span></code>

I found a more mature solution on Putang (ps. I forgot the URL, Google has a good solution). But what I tried didn't solve the problem at all. Later I found out that it was a problem with Sina Cloud EngineFor security reasons, some general headers can be sent repeatedly, but personalized headers cannot.

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The above has introduced the problem of headers already sent using the post method, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.