This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
There will no be error in the server. But you will not get the desired result when it displayed in the client (browser) (It will display characters in the browser). It because the browser will always assume you want to display text/html.