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What 404 error? See meaning of the most common problems | Browsers

Who has never tried to access a website and is faced with the Error 404 Not Found warning? The problem is common and even motivated web designers to create very creative error pages. In addition to 404, which basically indicates that the searched address does not exist, there are several other online problem messages.

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These flaws are described by status codes made up of three digits, which do not always point out problems. The first digit marks the code class. Those that start with 4 or 5 are the errors we see while 1, 2 and 3 are for other types of codes. The 4xx represent client failures and the 5xx show obstacles on the server. Find out the exact meaning of this and other recurring HTML errors when browsing the Internet from the list below.

Error 400 points to communication problem between the server and the client Photo: ReproductionError 400 points to communication problem between the server and the client Photo: Reproduction

Error 400 points to communication problem between the server and the client Photo: Reproduction

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The best known flaw appears when the URL searched does not correspond to any page. This usually happens when the user clicks on a broken link or when the site changes the location of a content without correcting the redirect links. Typing the address incorrectly is also a common cause of this error.

This error is due to a lack of understanding between the server and the client. In general, the browser sends data that does not respect the rules of the HTTP protocol and the server does not know how to process the request. This malformed syntax can happen due to some weakness on the part of the user, such as an unprotected operating system, an unstable connection, a browser defect or a cache problem.

401 – Authorization Required

This is an issue of access authorization. If the user tries to access a password-protected page without providing the correct credentials, they will be redirected to error message 401. When you have login data, there is no problem.

Similar to the previous one, the 403 code indicates that you are not allowed to see a certain page. Here, however, the server understands the request and knows who is trying to access it, but refuses to release the ticket. Probably because the content is private and can only be accessed through the site administrator, but not through the file directory structure.

When the client request takes too long, the server expires, closes the connection and displays error 408. That is, this means that the server did not receive a complete request within the expected time. Such failures, when frequent, can occur due to a very heavy workload on both the server and the client side. The reason, however, may be just a temporary decrease in Internet speed.

Code 502 represents a failure in the connection between servers Photo: ReproductionCode 502 represents a failure in the connection between servers Photo: Reproduction

Code 502 represents a failure in the connection between servers Photo: Reproduction

500 – Internal Server Error

Indicates that the server encountered an unexpected condition that prevented it from meeting the client's request. an internal server error, but the generic code 500. It appears when other, more specific server failures would not make sense. Although the problem does not leave the user, he can try some solutions, such as reloading the page, clearing the cache, clearing cookies or restarting the browser.

This error represents a communication anomaly between two servers. Sometimes, a server acts as an intermediary between the client and a superior server, as in the case of proxy access, for example. A Bad Gateway is due to an invalid response sent by the server that is further up the hierarchy. It may be down, but the most common reason is a disagreement between protocols for the exchange of data between servers.

Failure 404 looks on the one hand with 408 and, on the other hand, with 502. Once again, the issue of communication between one server and another is superior. In this case, there is a very long wait on the part of the first and, without knowing what to do, he cuts the connection. Only those who have access to the network can solve the problem.

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