What does 451 mean? What is the difference between HTTP page error codes 403 and 451?

Time:2021-7-16

Recently, 451 has been added to the Internet   The new error code status of not found webpage, and friends who often browse the webpage or consult information, I believe they have encountered many webpage problems, such as 404 not found, 403   For example, 404 means the web page was not found, 403 means the website refused to visit, so what does 451 mean? What’s the difference between it and 403 error? This article will popularize knowledge for you.

What does 451 mean?

four hundred and fifty-one   Not found is a new HTTP status error code for web pages. It is a new HTTP error code “451” officially approved by the Internet Engineering Steering Committee (iesg) a few days ago, which is used to represent the content that is “officially censored for legal reasons” and denied access.

451错误是什么意思?403和451错误有什么区别?
four hundred and fifty-one   Not found (451 error)

Tim Bree, a former Google engineer who proposed to use 451 code, said, “in the proposal, 451 code represents websites that cannot be accessed due to legal reasons. At the same time, it is suggested that specific reasons for legal restrictions and the categories of websites they belong to should be listed.”

Mark Nottingham, one of the leaders of the Internet Engineering Task Force (IETF), welcomed the introduction of the error code and said it could be used immediately. But he added that the Internet Engineering working group could not guarantee that all Internet service providers would use the code for legal reasons.

What’s the difference between 403 and 451 errors?

I believe many friends have encountered 403 error. Sometimes when a website has a problem, it will present 403 error, prompt: 403 Forbidden, prompt that the page cannot be accessed normally, as shown in the figure.

451错误是什么意思?403和451错误有什么区别?
403 Forbidden

403 error is a common error prompt in the process of website access, which means that resources are not available. The server understands the client’s request, but refuses to process it. It is usually caused by the permission setting of files or directories on the server, such as improper access permission setting in IIS or Apache.

So what’s the difference between 403 and 451 errors?

First of all, they all belong to one of the HTTP web page status codes. The former belongs to the improper setting of the server permissions, which leads to that the user accessing the web page does not have permission to access, thus prompting 403 error.

The 451 error is not caused by the server or network, but a prompt that the accessed content is officially censored due to legal reasons, blocked by Internet service providers, and cannot be accessed normally

Tips: other common webpage error codes:

403.1

403.1 the error is caused by the “execute” access being forbidden. If you try to execute CGI, ISAPI or other executable program from the directory, but the directory does not allow the program to be executed, this error will occur.

403.2

403.2 the error is caused by “read” access being prohibited. This error is caused by the fact that no default web page is available and directory browsing is not enabled for the directory, or the directory where the HTML page to be displayed resides is only marked with “executable” or “script” permission.

403.3

403.3 the error is caused by “write” access being prohibited. This error occurs when an attempt is made to upload a file to a directory or modify a file in the directory, but the directory does not allow “write” access.

403.4

403.4 the error is caused by SSL request. You must use “HTTPS” in the address of the web page you want to view.

403.5

403.5 error is caused by a web browser that requires 128 bit encryption algorithm. If your browser does not support 128 bit encryption algorithm, this error will appear. You can connect to Microsoft website to upgrade your browser.

403.6

403.6 the error is caused by the IP address being rejected. If there is a list of IP addresses in the server that cannot access the site, and the IP address you are using is in the list, you will return this error message.

403.7

403.7 error is due to the requirement of client certificate. When the resource to be accessed requires the browser to have the SSL client certificate recognized by the server, this error will be returned.

403.8

403.8 error is caused by forbidding site access. If there is a DNS name list in the server that cannot access the site and the DNS name you use is in the list, this information will be returned. Please note the difference between 403.6 and 403.8 errors.

403.9

403.9 error is caused by too many connected users. This error will be returned when the web server is too busy to process the request due to too much traffic.

403.10

403.10 error is caused by invalid configuration. When you try to execute CGI, ISAPI or other executable program from the directory, but the directory does not allow program execution, this error will be returned.

403.11

403.11 the error was due to a password change that did not allow you to view the page.

403.12

The 403.12 error was caused by the mapper denying access. If the web page you want to view requires a valid customer certificate, and your customer certificate map does not have permission to access the web site, it will return an error that the mapper refused to access.

403.13

403.13 the error is caused by the fact that the web page you need to view requires the use of a valid customer certificate, and the customer certificate you used has been revoked, or you cannot determine whether the certificate has been revoked.

403.14

403.14 the error was caused by the web server being configured not to list the contents of this directory and rejecting the directory list.

403.15

403.15 error is caused by too much client access permission. This error will be returned when the server exceeds its client access permission limit.

403.16

403.16 the error is caused by the untrusted or invalid customer certificate.

403.17

403.17 the error is caused by the customer’s certificate has expired or is not yet valid.

The above is the difference between the error code 403 and 451 of the webpage brought by developer. I hope it can help you. If you have any questions, you can leave us a message in the comment box below. We will try our best to answer for you. Thank you for your support as always, and please continue to pay attention to the follow-up tutorials and software of developer.