Meaning of the HTTP codes

These codes are returned by a server after receiving an HTTPS request (an Internet communication protocol that protects the integrity and privacy of each user’s data between your computer and the open website) and they help us find any kind of problem if there is one.

When the page we enter works correctly, no code will be presented to us on the screen: it will send us a 200 code, symbolizing that everything works as it should. On the other hand, if there is an error, any other code may appear within the 400 status. You are surely familiar with the 404 error because it is the most common when we cannot access a website, but what you may not know is that there are more than 60 status codes, each of them with a different purpose and that are classified into five categories: 100, 200, 300, 400, and 500. We are going to tell you what each of them is for and give you the definition of the most common errors or important.

Different types of status codes: Their 5 categories.

Status Codes 100

This type does not represent a problem but its only purpose is to inform that the exchange between the browser and the server was successful and that the process continues normally.

100 Continue: Instructs the server to continue with the requested process.
102 Processing: The browser received this request and continues to process the request.

Status Codes 200

Like the previous ones, these have a purely informative function, everything has been processed and projected correctly.

200 Ok: The operation was processed successfully.
204 No Content: The operation was processed correctly but the content is empty.

Status Codes 300

These codes are related to redirects, they indicate that the requested page has moved from the website. These are also not visible to the naked eye, but they help us to redirect users to other pages.

300 Multiple Choices: It tells us that there are several options for the requested content.
307 Temporary Redirect: Indicates that the browser of the requested page has moved but is still available on that page.

Status Codes 400

These are the best known and most common, since they are usually shown to the end user. They indicate client errors (bad typing of the page, not searching in the right place, etc).

400 Bad Request: The request made to the browser is not correct, sometimes it can be solved by reloading or refreshing the page.
452 Unavailable for Legal Reasons: It means that the requested content is not authorized for legal reasons.

Status Codes 500

Unlike the 400 codes, these errors are generated by the server and for this reason it is more difficult to solve.

500 Internal Server Error: Indicates that the error is from the server, without any specified origin and whose only solution as a user is to wait for the problem to be resolved on its own.
503 Service Unavailable: The error is not available at the requested time, almost always due to an overload of users inside or due to maintenance. Also, your only solution is to wait for the problem to be solved by someone else.
If you want to know all the HTTP status codes and what each one means, you can read this Mozilla article.


Optimize your SEO with redirects

Use the 300 status code to avoid errors and gain search engine positioning.

The 301 redirect along with the 302 indicate that the requested page has moved location temporarily or permanently. When this happens, what must be done is a “resend” from the old URL (the one that does not work) to the new URL so that it does not affect user navigation. If you delete a URL and don’t redirect to its new location, when clients try to log in they’ll run into an error.

Use 301 redirect to transfer SEO force to a new URL

The 301 redirect tells us that the website we are looking for has been permanently moved or modified: By using this code, when Googlebot enters your website and notices that the URL does not work, it will send the user to the updated URL address . You can use this redirect in some of these situations:

Take advantage of the positioning of an old post in disuse.
Create a new page of better quality, and prevent problems due to duplicate content.

In a domain change.

It is estimated that after 6 months these new URLs will be widely propagated, although it is advisable to wait a year before deleting the old ones.

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Indicate a temporary URL change with 302 redirects

The 302 redirect indicates that the site was temporarily moved or modified: In this case, the force of SEO is not transferred when we change the URL because it has been designed in such a way that it is used when content must be redirected to a page. not final. When the time comes to remove the redirect, your website will not have lost its search engine rankings.

Using redirects correctly can make the difference between a polished and optimized SEO job, an unprofessional or incomplete SEO.

What does a 404 error mean?

The most famous of mistakes. We are sure that you have ever come across this common error, and if not, then you have heard of it.

The 404 status code is one of the most frequent and occurs when trying to enter a website the page, instead of loading correctly, shows you a message saying “404 page not found”. This tells you that the requested site does not exist or is not available, either because it was removed or because you have entered the address incorrectly and prevents you from being able to navigate to it.

The presence of this inconvenience can bring great consequences to your website, and one of the biggest is that it affects your SEO and therefore causes you to drop in the search results. Therefore, it is important to locate these types of problems to solve them as soon as possible. Here are some free tools that can help you with this:


Tool to detect 404 errors and broken links

W3C Link Checker

Analyze each link included by the website (both ours and external). Just add the desired URL and the tool will analyze that nothing is wrong.

Dead Link Checker

It works in the same way as the previous one and is also very handy for analyzing possible 404 errors.


It uses Google Crawler to quickly detect invalid URLs, and once fixed they are marked as “fixed” or “fixed”.

Custom 404 Error Page

Creating error pages that replace standard pages, custom 404 pages that describe possible causes of errors and include search engines, or links to the most popular sections, will help you significantly improve your user experience.

Reverse Machine

Internet “time machine”. The WayBack Machine is a database with an endless number of websites that have ceased to exist due to some kind of error, and it allows us to see what certain pages looked like years ago. This is the history of websites that no longer exist or have been updated. Detects 404, 408, 410, 451, 500, 502, 503. 504, 509, 521, 523, 524, 525 and 526 errors, which are caused by incorrect user typing in web addresses or user errors. creator on his own page.

With this “Internet time machine” we can access information that has been deleted for various reasons safely and for free, because this site was developed without profit and with the sole purpose of creating an Internet “museum”.

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Gerard Heperd

Gerard Heperd