When you set some string so long so server cannot process it anymore it cause DOS sometime
Create app and put field like username or address or even profile picture name parameter ( second refrence ) like 1000 character of string .
Search A's account from B's account either it will
- Either it will keeping on searching for long time
- Either the application will crash (500 - Error Code)
https://medium.com/@shahjerry33/long-string-dos-6ba8ceab3aa0
https://hackerone.com/reports/764434