What is a ‘400 Bad Request’ Error?

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What is a 400 Bad
Request Error?
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• The 400 Bad Request meaning is the server could
  not understand or unable to process a clients
  request due to malformed or incorrect formatting.
• When a server encounters this error, it means
  that the request sent by the client cannot be
  understood and the server cannot determine its
  status code category. This error arises from
  issues such as syntax errors, invalid data, or
  missing parameters.

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What does 400 Bad Request Error look like on
different Browsers?

• You must have seen 400 Bad Request Errors many
  times on your Chrome browser, and it is a fact
  that, just like the 404 Not Found error, the 400
  Bad Request error can also be customizable and
  may appear differently on different browsers.
• If the website doesnt have a custom error page,
  the browser will display the default error page.
  Lets take a look at how it appears on different
  browsers.

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Why does 400 error occur?

• There can be various reasons that cause 400 Bad
  request errors and even this error is not limited
  to only certain Browsers or Operating systems.
  Therefore, the troubleshooting method can be
  varied.

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• Incorrect URLs
• Invalid or missing request headers
• Corrupt Browser Cache and Cookies
• DNS Lookup Cache
• Large request size exceeding server limits
• Invalid or unsupported HTTP methods
• Server glitch