Well, I would not like but hear this error code for the first time anyway after I have my eyes over the question, I started Googling around a bit and got this
What is 418 Status Code- The responding entity may be short and stout.
Why it occurs- This code was defined as one of the traditional IETF April Fools' jokes, in RFC 2324, Hyper Text Coffee Pot Control Protocol, and is not expected to be implemented by actual HTTP servers.
How to Fix 418 Error Code- This is a type of http error and If you are monitor your website through 100pulse, we will intimate whenever you encounter 418 status code error through e-mail or Short message service.
According to howtogeek.com, code 418 “I’m a teapot” intended to politely inform the recipient that the device they are attempting to brew coffee with is, in fact, a teapot and incapable of producing the coffee they desire. This error commonly occurs when the system has regular maintenance.