It simply means the web server was unable to understand the request of the client and process it.
Wen says bad request the server isn't offline, you can change it in server.properties.
bad
400 Bad Request
It simply means the web server was unable to understand the request of the client and process it.
Please find below an article I have written on my blog to solve that issue: "How to Fix the "400 Bad Request" error message from a website" http://wp.me/p2519N-cB
A "bad request" typically refers to an error message indicating that the server cannot process the request due to client-side issues, such as malformed syntax or invalid request parameters. In HTTP terms, it corresponds to a 400 status code, signaling that the server considers the request to be invalid or improperly formatted. This often occurs when the client sends data that the server cannot understand or when required information is missing.
Bad RequestYour browser sent a request that this server could not understand.newdiv
Bad RequestYour browser sent a request that this server could not understand.newdiv
Bad RequestYour browser sent a request that this server could not understand.newdiv
Bad RequestYour browser sent a request that this server could not understand.newdiv
Bad RequestYour browser sent a request that this server could not understand.newdiv
None to my knowledge - it would be bad business and bad for his or her image for an artists to request their fans leave their concerts.