A basic curl command to check if a web site is available…

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curl \
  --connect-timeout 10 \
  --head \
  --silent \
  --show-error \
  --insecure \
  https://myapp.mycompany.com/dashboard/

Typical response:

HTTP/1.1 302 Moved Temporarily
Date: Thu, 21 Mar 2013 23:45:15 GMT
Server: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 mod_jk/1.2.32
X-Powered-By: Servlet/3.0 JSP/2.2 (GlassFish Server Open Source Edition 3.1.2.2 Java/
Sun Microsystems Inc./1.6)
X-Powered-By: JSF/2.0
Set-Cookie: JSESSIONID=f5798d61221140ff4defd299e168; Path=/dashboard; Secure; HttpOnly
Location: https://myapp.mycompany.com/dashboard/login;jsessionid=f5798d61221140ff4defd299e168
Content-Language: en-US
Content-Length: 234
Vary: Accept-Encoding
Content-Type: text/html;charset=ISO-8859-1

And then:

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grep 'Location:.*/login'