Why is Tomcat sending "Connection: close?"

[John.E.Gregg]

All,

I'm using Tomcat 7.0.70 and am having trouble understanding why Tomcat is 
sending "Connection: close" in the response header as often as it is.  With 
almost no load on the server, I get "Connection: close" pretty much every time. 
 The client is sending "Connection: keep-alive" but it doesn't seem to matter.  
HTTP protocol is 1.1 and response code is 200.

In other cases I've seen Tomcat behave exactly the way the doc says the below 
config should behave (100 requests per connection as long as the timeout is not 
exceeded) but not this time.

Any idea why this is occurring or where to look to debug it?  I've tried 
setting breakpoints in AbstractHttp11Processor where "Connection: close" is 
set, but it's not hit.

Thanks

John

Here is my connector config:

<Connector port="7124"
        protocol="HTTP/1.1"
        SSLEnabled="true"
        maxThreads="80"
        maxKeepAliveRequests="100"
        keepAliveTimeout="10000"
        scheme="https"
        secure="true"
        clientAuth="true"
        sslProtocol="TLS"
        sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2,SSLv2Hello,SSLv3"
        keystoreFile="${keystoreFile}"
        keystorePass="${keystorePassword}"
        keyAlias="test"
        truststoreFile="${truststoreFile}"
        truststorePass="${truststorePassword}"
        allowUnsafeLegacyRenegotiation="false"
                ciphers="SSL_DH_DSS_WITH_3DES_EDE_CBC_SHA, 
SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA, SSL_DHE_RSA_WITH_3DES_EDE_
CBC_SHA, SSL_DH_RSA_WITH_3DES_EDE_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA, 
SSL_RSA_WITH_RC4_128_SHA, TLS_DHE_DSS_WITH_AES
_128_CBC_SHA, TLS_DHE_DSS_WITH_AES_256_CBC_SHA, 
TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_RSA_WITH_AES_256_CBC_SHA, TLS_
ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA, 
TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_EC
DSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WIT
H_3DES_EDE_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_ECDH_RSA_WITH_3DES_EDE_C
BC_SHA, TLS_ECDH_RSA_WITH_AES_128_CBC_SHA, TLS_ECDH_RSA_WITH_AES_256_CBC_SHA, 
TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH
_AES_256_CBC_SHA"
        />