Problem: Let me in. Let me iiiiiiinnnnnnnnnnnnnnnnnnnn http://mercury.picoctf.net:36622/

Solution:

https://everything.curl.dev/http/requests

Using https://reqbin.com/req/c-ea0d5rlb/curl-add-header

Going to the page it tell you, you need to use the PicoBrowser.

curl -A "PicoBrowser" http://mercury.picoctf.net:36622/

After setting the user agent to PicoBrowser is says “I don’t trust users visiting from another site.”

curl -A "PicoBrowser" -H "Referer: http://mercury.picoctf.net:36622/" http://mercury.picoctf.net:36622/

“Sorry, this site only worked in 2018.”

curl http://mercury.picoctf.net:36622/
	-H "user-agent: PicoBrowser"
	-H "Referer: http://mercury.picoctf.net:36622/"
    -H "Date: Sun, 18 Mar 2018"

“I don’t trust users who can be tracked.”

curl http://mercury.picoctf.net:36622/
	-H "user-agent: PicoBrowser"
	-H "Referer: http://mercury.picoctf.net:36622/"
    -H "Date: Sun, 18 Mar 2018"
    -H "DNT: 1"

“This website is only for people from Sweden”

curl http://mercury.picoctf.net:36622/
	-H "user-agent: PicoBrowser"
	-H "Referer: http://mercury.picoctf.net:36622/"
    -H "Date: Sun, 18 Mar 2018"
    -H "DNT: 1"
    -H "X-Forwarded-For: 2.16.69.255"

“You’re in Sweden but you don’t speak Swedish?”

curl http://mercury.picoctf.net:36622/
	-H "user-agent: PicoBrowser"
	-H "Referer: http://mercury.picoctf.net:36622/"
    -H "Date: Sun, 18 Mar 2018"
    -H "DNT: 1"
    -H "X-Forwarded-For: 2.16.69.255"
    -H "Accept-Language: SV"

no-alignment

Flag: picoCTF{http_h34d3rs_v3ry_c0Ol_much_w0w_0da16bb2}