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What are error messages in HTML?

Fouzia Bashir

Overview

Have you ever encountered a "404 not found" message in response to a query on the browsers? These situations occur when there is a problem with the server-side code, and it sends back a message to the client indicating the presence of the problem. Let’s dig into these HTML error messages and learn what a specific code means.

Error codes and their interpretation

Error Code

Meaning

Description

100

Continue

The client should continue sending the request to the server since the server has signaled to proceed with the current request.

101

Switching protocols

This means that server has accepted the client's request to switch to the new protocol.

103

Checkpoint

This is displayed when resuming any of the client's pending PUT or POST requests.

200

OK

The client's request is totally fine from the server's point of view. (Mission successful).

201

Created

The previous request is completed and a brand new resource is created for the next attempt.

202

Accepted

The client's request is now accepted by the server but is still in process.

203

Non- Authoritative Info

The server now displays the results from a third-party website.

204

No Content

The server has successfully processed the client's request but there is nothing present to display.

205

Reset the content

There is nothing present to display for our request. The server asks to reset the content.

206

Partial Content

Only a little bit of information is displayed.

300

Multiple Choices

The server sends back five choices for the user so they can choose the one final location.

301

Moved Permanently

The page has been moved to a new URL.

302

Moved Temporarily

The page has been temporarily moved to a new URL.

303

See Other

The page can now be found on a new URL.

304

Not Modified

The user requested page is not changed since they last requested for it.

400

Bad Request

The user's request is impossible to complete since it has a syntax issue.

401

Unauthorized

This is a legal request, but the user is unable to provide valid inputs for accessing the file or directory.

403

Forbidden

The server is denies to display the requested webpage.

404

Not Found

The page you are currently looking for is not found

405

Method not allowed

The method through which you are sending a request to access the desired page is not supported by that page.

406

Not Acceptable

The resultant output will be unacceptable by the client-side.

407

Proxy Authentication required

The client must authenticate themselves for an in-use proxy because only specific proxies can use the requested resource.

408

Request Time out

The server was waiting for the request but no request was received. Therefore, the "Request Time Out" message is shown.

409

Conflict

There is a conflict in the client-side request therefore it can't be processed.

410

Gone

The page requested by the client is not available.

411

Length Required

The server needs to know the length of the content to be displayed. Otherwise, it won't accept the request.

412

Precondition failed

The desired prerequisite of the request is not fulfilled or the provided one is not correct according to the server.

413

Request entity too large

Our request contains a data/file that exceeds the server's file size limit.

414

Request URL too long

The server can't interpret that long URL requested by the client in a request.

415

Unsupported Media Type

The server denies the request due to the unsupported media type present in the request.

416

Requested range is not satisfiable

The client has requested a specific portion but the server can not fulfill this request.

500

Internal Server Error

This is a general error message, mostly due to the errors in the code we are dealing with.

501

Not Implemented

The server is unable to provide support for the requested method.

502

Bad Gateway

The server has received an invalid response from the high-end server.

503

Service Unavailable

The server is currently unavailable due to a lack of resources to handle the overloaded requests. Alternatively, it might be down for some other reason.

504

Gateway Timeout

The server is acting as a gateway and was waiting for an on-time response but hasn’t received any from the other server (Higher-end server).

505

HTTP version not supported

The server does not support the HTTP version used in the request.

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