Very fast concurrent check of many HTTP/s URLs. (thousands requests per seconds, more then 3 million requests per hour on cheap VPS)

urls.txt is simple one url per line, e.g.:

https://httpbin.org/delay/10
https://httpbin.org/status/200
...

Simplest case, just get status (if no errors):

$ ./bulk-http-check < urls.txt 
https://httpbin.org/status/404 OK 404
...

Show specific HTTP header (and use 20 concurrent connections):

$ ./bulk-http-check -n 20 -s content-type < urls.txt 
https://httpbin.org/json OK 200 application/json
... 

If you want to know content-size, it could be little more tricky. Most reliable is to combine -l flag with -g (use HTTP GET method instead of HEAD). Sometimes Content-Length (reported from server) does not reflect real payload size because of encoding/gzipping (in this case, it's unavailable in headers).

$ ./bulk-http-check -l -g < urls.txt 
https://httpbin.org/status/200 OK 200 0
https://www.google.com/1 OK 404 1562
https://httpbin.org/json OK 200 429

If specify -b N, bulk-http-check will print benchmark results on stderr, like:

# runs 10 seconds, processed 14302, rate: 1430.20/sec
# runs 20 seconds, processed 49920, rate: 2496.00/sec
# runs 30 seconds, processed 125943, rate: 4198.10/sec

Option -x N to eXit automatically after N seconds.

Core i5 is my home desktop with 100Mbps Internet. CX11 is cheapest hetzner VPS with 2Gb RAM, AX51-NVMe is dedicated Hetzner server with 8 cores, 16 threads and 64Gb. Numbers in table are requests per second.

* - Errors happened during tests, mostly timeouts because hit bandwidth limit.

I checked 15 million URLs on 1MB RAM virtual server (200 connections) in less then 5 hours with final benchmark:

runs 17160 seconds, processed 15276607, rate: 890.25/sec

If you have Golang installed:

go install github.com/yaroslaff/bulk-http-check

git clone https://github.com/yaroslaff/bulk-http-check
cd bulk-http-check
go buld
cp bulk-http-check /usr/local/bin

Visit Latest release and download bulk-http-check from there. Then do:

chmod +x bulk-http-check
cp bulk-http-check /usr/local/bin

$ ./bulk-http-check -h
Usage of ./bulk-http-check:
  -1	Disable HTTP/2 support
  -g	use GET method instead of HEAD
  -l	Show Content-length
  -n int
    	Number of connections (default 5)
  -s string
    	Show this header
  -t int
    	Timeout (5) (default 5)