It is a simle tool, to check proxies against test url.

Proxies to check must be stored in a CSV file like:

head -n5 ./data/test_prxoxies.csv

IP Address	Port
93.64.183.162	56508
92.220.168.252	80
82.77.114.201	3128
52.233.190.21	80
...

Output file is going to be like:

head -n5 ./data/checked_proxies.csv 

IP	Port	HTTP Code	Response Duration	Error message
81.24.82.69	37016	0	0.055434	Head http://www.profinance.ru/: proxyconnect tcp: dial tcp 81.24.82.69:37016: connect: no route to host
91.203.114.105	45770	0	0.055207	Head http://www.profinance.ru/: proxyconnect tcp: dial tcp 91.203.114.105:45770: connect: connection refused
82.100.4.63	30595	0	0.092923	Head http://www.profinance.ru/: proxyconnect tcp: dial tcp 82.100.4.63:30595: connect: connection refused
40.91.214.91	80	405	0.127598

go run main.go -h
Usage of /tmp/go-build170132499/b001/exe/main:
  -output string
    	Folder, result file will be stored to
  -source string
    	Path to CSV file with proxies to check
  -threads int
    	Number of threads (default 5)
  -timeout int
    	Timeout per request, s (default 5)
  -url string
    	URL to test proxy
  -verbose
    	Log output

Command line example:

go run main.go \
    -source=./data/test_prxoxies.csv \
    -threads=50 \
    -url=http://www.profinance.ru/ \
    -timeout=5 \
    -output=./data/ \
    -verbose=true

Also, can be run in docker (see Dockerfile):

docker run \
    --rm \
    -u $(id -u):$(id -g) \
    -v $(find "$(pwd)" -name 'data'):/data/ \
    check_proxies \
        -source=/data/test_prxoxies.csv \
        -threads=250 \
        -url=http://www.profinance.ru \
        -timeout=10 \
        -output=/data \
        -verbose=true