By Ezra Zygmuntowicz, Bruce Tate, Clinton Begin

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You can drop code into Rails by using<%= your_code_here %>. jpg' /> You can easily prevent this problem by using the template helpers. If you surround your code with <%=h your_code_here %>, Rails will escape any HTML code a malicious user may provide. Don’t Evaluate Input At the same time, you need to be sure not to evaluate any code that any user might type as input. Ruby is a great scripting language, but you should be careful anytime you try to evaluate any code, and you should never evaluate user input.

Mongrel uses the best of both the Ruby and C worlds. Internal HTTP parsing is done in C, and the API for configuration and application interface is done with Ruby. This C foundation gives it very good speed, and the clean Ruby wrapper provides a familiar Ruby interface for configuration and extension. Mongrel offers huge deployment advantages because it breaks away from opaque protocols like FastCGI or SCGI and uses plain HTTP for its transfer mechanism. HTTP is a proven, well-tooled, transparent protocol that all sysadmins know well.

And periodically, you should run statistics so the database optimizer knows when to use indexes. Database administration performance techniques are beyond the scope of this book. 43 ✔ Finding a Starter Home Chapter 3 Shared Hosts Finding a host for your first Rails app is a lot like finding your first home. When I left home the first time, I wanted to move right into a castle, but real life doesn’t work out that way. Most people first move into an apartment or dorm room. True, apartments don’t come with their own throne room and servants’ quarters, but they do have their advantages.

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