reuse
Simple Go app to test TCP and SSL/TLS session reuse. This is similar to httpstat, except httpstat only makes one connection. Reuse makes multiple connections and shows what parts of the connection process are reused. Command line options are inspired by curl.
Usage
Usage:
reuse [OPTIONS] URL
Application Options:
-r, --repetitions= Number of times to repeat connecting (default: 2)
--max-redirs= Maximum number of redirects to follow (default: 10)
-k, --insecure Skip SSL Verification
-V, --version Print Version number and exit
-d, --data= Data to send
-X, --request= HTTP method (default: GET)
-w, --wait= Time to wait between connections (default: 5s)
-H, --header= Additional Header
Help Options:
-h, --help Show this help message
Arguments:
URL: URL to connect to
Output
lport Remote Address Rsp DTS DNS TCP SSL TConn Srv Reply Total
...
--- statistics ---
Min Max Mean StdDev Median MAD
DNS
TCP
SSL
TConn
Srv
Reply
Total
lport
This is local port number of the outgoing connection.
Remote Address
This is the IP address and port number of the machine reuse is connecting to
Rsp
This is the HTTP Response code from the connection
DTS
This is actually 3 items. D represents if DNS coalescing was used during the call. 1 for True, 0 for False. T represents if an existing TCP connection was reused. 1 for True, 0 for False. S represents if SSL parameters were reused from an existing session. 1 for True and 0 for False.
It is worth noting that if the TCP session is re-used, then the application will NOT report that the SSL session was re-used. This is because it records if during SSL negotiation previously agreed upon parameters are reused. If the TCP session is reused there is no SSL negotiation, the existing parameters are used.
DNS
This is the time in milliseconds between Starting a DNS query and receiving an answer.
TCP
This is the time in milliseconds between when a TCP connection is established and when the DNS query is returned.
SSL
This is the time in milliseconds between the time a TCP connection is established and when the request is written.
TConn
This is the total time in milliseconds between when Go requests a connection and when one is returned. This includes the DNS, TCP and SSL times.
Srv
This is time in milliseconds between when the request is written and the first byte of the response is received.
Reply
This is the time in milliseconds between when the entire response is received and when the first byte is received.
Total
This is the time in milliseconds to request the connection and receive a response.
Summary Statistics
Min
This is the smallest value seen during the run.
Max
This is the largest value seen during the run.
Mean
This is the sum of values collected during the run divided by the number of values. This can be skewed by outliers.
StdDev
This is the Standard Deviation of the data set. This gives a measure of statistical dispersion and is not resilient to outliers in the data.
Median
This is the value where half the values are above and half are above. This value is is not skewed as much by extremely large or small values.
MAD
This is the Median Absolute Deviation. This gives a measure of statistical dispersion, and is resilient to outliers in the data.
Example Missing TCP keepalive window
reuse -k -r 10 -w 6s 'https://api-example.target.com/v1?q=123456&key=APIKEY'
lport Remote Address Rsp DTS DNS TCP SSL TConn Srv Reply Total
52600 10.97.109.188:443 200 000 36.6 11.3 47.3 95.1 17.3 0.4 113.1
52601 10.97.109.188:443 200 001 2.5 12.8 21.9 37.2 19.6 0.2 57.1
52602 10.97.109.188:443 200 000 392.6 17.3 43.1 453.0 20.9 0.2 474.2
52604 10.97.109.188:443 200 001 2.5 11.7 20.0 34.2 17.3 0.3 51.9
52605 10.97.109.188:443 200 001 2.4 15.5 14.1 32.0 15.7 0.2 48.0
52606 10.97.109.188:443 200 000 2.6 10.6 32.0 45.1 24.3 0.2 69.8
52607 10.97.109.188:443 200 001 412.2 12.7 11.6 436.4 16.4 0.3 453.2
52609 10.97.109.188:443 200 000 2.6 9.1 47.9 59.5 25.1 0.2 85.0
52611 10.97.109.188:443 200 001 2.5 9.6 10.2 22.4 27.6 0.2 50.3
52612 10.97.109.188:443 200 000 2.4 15.6 33.7 51.6 22.3 0.2 74.3
--- statistics ---
Min Max Mean StdDev Median MAD
DNS 2.4 412.2 85.9 158.6 2.5 0.1
TCP 9.1 17.3 12.6 2.6 12.2 2.1
SSL 10.2 47.9 28.2 13.9 27.0 14.1
TConn 22.4 453.0 126.7 160.2 48.4 15.3
Srv 15.7 27.6 20.7 3.9 20.3 3.4
Reply 0.2 0.4 0.3 0.1 0.2 0.0
Total 48.0 474.2 147.7 159.2 72.1 21.0
Example hitting TCP keepalive window
reuse -k -r 10 -w 3s 'https://api-example.target.com/v1?q=123456&key=APIKEY'
lport Remote Address Rsp DTS DNS TCP SSL TConn Srv Reply Total
52622 10.97.109.188:443 200 000 128.5 15.2 56.9 200.5 18.2 0.3 219.3
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 16.5 0.2 16.8
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 17.7 0.3 18.1
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 26.6 0.2 26.9
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 15.3 0.2 15.6
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 17.0 0.3 17.4
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 14.5 0.2 14.9
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 18.5 0.2 18.9
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 15.9 0.2 16.2
52622 10.97.109.188:443 200 010 0.0 0.0 0.0 0.0 17.3 0.2 17.7
--- statistics ---
Min Max Mean StdDev Median MAD
DNS 0.0 128.5 12.9 38.6 0.0 0.0
TCP 0.0 15.2 1.5 4.6 0.0 0.0
SSL 0.0 56.9 5.7 17.1 0.0 0.0
TConn 0.0 200.5 20.1 60.1 0.0 0.0
Srv 14.5 26.6 17.8 3.2 17.1 1.2
Reply 0.2 0.3 0.3 0.0 0.2 0.0
Total 14.9 219.3 38.2 60.5 17.5 1.3