How to manually output 404 pages in a program

A 404 page is a page that the server fails to provide information when the client is browsing the web, or the server is unable to respond and does not know the reason. When the user enters the wrong link, the page that returns, it tells the viewer that the page they requested does not exist or the link is wrong, while directing the user to use the other page instead of closing the window to leave, customizing the 404 error page is a good practice to enhance the user experience.

Second, the role of the 404 page.

The 404 page is a must-have page, which carries the heavy responsibility of user experience and SEO optimization. A 404 page is usually a 404 error returned by the server when the user visited a page that does not exist or has been deleted. If the webmaster does not set up a 404 page, there will be dead links, spiders crawling and other **, which is not conducive to search engine indexing.

404 page role.

3. 404 page error prompt.

Fourth, the impact of 404 pages on SEO.

Custom 404 error pages are a good practice to enhance the user experience, but the impact of the 404 page on search engines is often not noticed during application, for example, the wrong server-side configuration results in a status code of "200" or a custom 404 error page returns a status code of "302" using meta refresh.

5. Benefits of 404 page setup.

1. Guide users not to close** to enhance the user experience.

Do you just want to save the value of $c, how is the data created, and do you want to save the results of each time, or just the last time? Let's say you want to keep the result every time, then the table structure looks like this: tab(fdate date primary key,fstr varchar); Then the saved statement should be written in the best.

It needs to be used. htaccess file configuration.

A 404 page is the page that is returned when a user enters the wrong link. The 404 not found404 page is the page that is returned when the user enters the wrong link. The purpose of the 404 page is:

A 404 page is a page that is returned when the user enters the wrong link, which means that the link to the page you want was not found on the server. The purpose of a 404 page is to tell the viewer that the page they are requesting does not exist or is incorrectly linked, while directing the user to use a different page instead of closing the window and leaving.

The address entered by the user is linked incorrectly, resulting in a message indicating 404 not found in IIS.

The page that should have been on the server has been deleted, this situation is mostly posted in the BBS forum, the post of n years ago is now searched by you through the search engine, but in fact, the BBS forum in order to ensure the reasonable use of the server's resources, will delete the expired or very old information page, resulting in 404 not found.

DNS settings block, as far as the Chinese environment is concerned, there are some foreign banned ** browsing in China will also appear 404 not found phenomenon, which requires the use of ** server to be able to browse normally.

From a professional point of view, there are three reasons for this:

The website cannot be accessed on the requested port.

This request is blocked by the web service extension lock policy.

This request is blocked by the MIME mapping policy.

This question. How to view (for example):

If there are no 404 pages, it will be returned.

not found

the requested url /123456789 was not found on this server.

Status codes like this.

The following says the 404 page of the detection **

Here we mainly look at the return status of the page, for example, the return status in the above figure is 200, and some common status codes are:

200 - The server successfully returned to the web page.

404 - The requested web page does not exist.

503 - Service unavailable.

Hope it helps!

Let's open the folder where the site is located, and my site is under the DjangoWeb folder to use the files.

Find debug and set it to false

When you open a non-existent URL, there will be no error message.

**Background address is wrong.,Or**Attacked by or 晌,Guess that the Sakura address has been tampered with.,Or deleted.,I want to think if it's changed.,If not.,Check if it's not a hanging horse.,Hurry up to make up for the loopholes.,Do it safe.,If not, I can provide technical support.。

It should be caused by the wrong address where you entered the background.

Take a screenshot to see the actual situation.