title: Creating rule on reverse proxy mod_security
body: <p>I built up the reverse proxy using mod_security on my system</p>
  
  <p>I got problem when wrote rule on specify website</p>
  
  <p>For example i have 2 websites a.com and b.com, both of them has parameter username</p>
  
  <p>if i want to deny value abc on that parameter, my rule will be:</p>
  
  <pre><code>SecRule ARGS:username "@streq abc"
  </code></pre>
  
  <p><strong>but i only want to deny value abc on parameter username at a.com, not b.com</strong></p>
  
  <p>what should i do? </p>
  
  <p>thank in advance :)</p>