With the rapid development prospects of the Internet age, coupled with expensive bidding costs, most companies are miserable, so the low-cost investment occupation-Seo is born, and the number of employees is increasing each year, however, there are more and more junk information on the Internet, so search engines have made frequent algorithm adjustments to better cater to user experience. During this period, of course, many websites were downgraded or even K-dropped. As for the reason, many employees still cannot find the root cause of the problem, I will share with you my many years of experience, hoping to help you restore your site rankings as soon as possible.
Go to the topic:
I. Space Problems
Due to the unstable query speed and sometimes slow and sometimes cannot be opened, many cases of permission downgrading are involved. Therefore, the author suggests that you do not buy a cheap space for cheap images before making your own site. Instead, you must choose a guaranteed and fast domestic space. If you want to know whether your site cannot be opened during the previous update, you can view the space log. Here I have sorted out the common search engine crawling return code.
1xx (temporary response) indicates the status code that responds temporarily and requires the requester to continue the operation.
100 (CONTINUE) the requester shall continue to make the request. The server returns this code, indicating that the first part of the request has been received and is waiting for the remaining part.
101 (switching protocol) the requester has requested the server switching protocol, and the server has confirmed and is ready to switch.
2XX indicates that the request status code is successfully processed.
200 (successful) the server has successfully processed the request. Generally, this indicates that the server provides the requested webpage.
The 201 (created) request is successful and the server creates a new resource.
202 (accepted) the server has accepted the request but has not yet processed it.
203 (unauthorized information) the server has successfully processed the request, but the returned information may come from another source.
204 (NO content) The server successfully processed the request, but did not return whatever content.
205 (reset content) The server successfully processes the request, but does not return whatever content.
206 (partial content) The server successfully processes some GET requests.
3xx (redirection) indicates that the request is completed and further operations are required. These status codes are usually used for redirection.
300 (multiple options) for requests, the server can run multiple operations. The server selects an operation based on the user agent or provides an operation list for the user agent to select.
The webpage of the 301 (permanent mobile) request has been permanently moved to a new location. When the server returns this response (response to a get or head request), it automatically redirects the requester to a new location.
302 (temporarily mobile) server now responds to requests from different locations, but the requester should continue to use the original location for future requests.
303 (view other locations) The server returns this code when the requester uses a separate GET request for different locations to retrieve the response.
304 (not changed) the requested webpage has not been changed since the last request. When the server returns this response, no webpage content is returned.
305 (using proxy) the requester can only use the proxy to ask the requested webpage. If the server returns this response, it also indicates that the requester should use a proxy.
307 (temporary redirection) The server now responds to requests from different locations, but the requester should continue to use the original location for future requests.
The status code 4xx indicates that the request may be faulty, which hinders server processing.
400 (incorrect request) the server does not understand the request syntax.
401 (unauthorized) requests require authentication. The server may return this response for webpages that require logon.
403 (Forbidden) The server rejects the request. 404 (not found) server cannot find the requested webpage.
405 (method disabled) disable the method specified in the request.
406 (unacceptable) unable to respond to the requested webpage using the requested content features.
407 (proxy authorization required) this status code is similar to 401 (unauthorized), but the specified requester should authorize the use of the proxy. 408 (request timeout) timeout occurred when the server waited for the request.
409 conflict occurs when the server completes the request. The server must include conflict information in the response.
410 (Deleted) If the requested resource has been permanently deleted, the server returns this response.
411 (valid length required) the server does not accept requests that do not contain valid Content Length header fields.
412 (not meeting the prerequisites) the server does not meet one of the prerequisites set by the requester in the request.
413 (the Request Entity is too large) The server cannot process the request. Because the Request Entity is too large, it exceeds the server's processing capability.
414 (the requested URI is too long) The request URI (usually the URL) is too long and cannot be processed by the server.
415 (unsupported media type) The request format is not supported by the request page.
416 (the request range does not meet the requirements) if the page cannot provide the request range, the server returns this status code.
417 (not meeting expectations) the server does not meet the "expectation" request header field requirements.
The status code 5xx indicates that the server encountered an internal error when trying to process the request. These errors may be server errors rather than request errors.
500 (internal server error) The server encounters an error and cannot complete the request.
501 (not implemented yet) the server does not have the function to complete the request. For example, this Code may be returned when the server cannot identify the request method.
502 (error gateway) server, as a gateway or proxy, receives an invalid response from the upstream server.
503 (Service unavailable) The server cannot be used at the moment (because of overload or downtime maintenance ). Generally, this is only a temporary state.
504 (gateway timeout) The server acts as the gateway or proxy, but does not receive the request from the upstream server in time.
505 (the HTTP version is not supported) the server does not support the HTTP protocol version used in the request.
2. downgrading of links to websites or other websites in the same space
1. The link is downgraded and the website is immediately deleted. The website is switching a connection with a website with high relevance to the industry.
2. Permission downgrading for other websites in the same space to replace independent Space
3. website content
Low originality, not updated for a long time, mostly collection or pseudo-original content, enhancing content quality and updating
4. Too much code affects the speed of webpage opening
Use the Baidu webmaster tool to delete excessive redundant code on the site
5. Website Images
Currently, many website codes are not processed in absolute address mode, and competitors often prefer to use this image to degrade their websites.
6. The home page is blocked.
This phenomenon mainly targets Baidu. The solution is to change the server's host header index to another page or modify the homepage file name.
VII. Over-Optimization
Some friends do not have a very good grasp of the degree of site optimization, and they have used all the available means. The result is not only poor ranking, but also counterproductive. How can we grasp this degree in detail, there is no fixed number, but it can be said that you have to go through a lot of practices and operations to sum up some rules or skills.
8. Three tags in the site have been modified recently.
You have recently modified the homepage title, keywords, descriptive descriptions, or frequently modified them.
IX. High page keyword heap withdrawal Density
This kind of phenomenon is very easy to get cheated by search engines, but often some SEOR don't pay attention, and the keywords to be done are often displayed everywhere on the entire page, as a matter of fact, in today's most user experience, we need to make the keyword layout natural, not to be able to pile up.
10. Websites infected with Trojans
This phenomenon is not often seen, so we need to pay attention to our site snapshots, home page source code and collection changes to prevent them from happening.
11. Sudden decrease in external links or indexed items
The external link suddenly decreases a lot mainly because the external connection quality of your website is not high, and the search engine Deletes your connections as junk connections during update and adjustment, so we need to make some highly correlated connections when doing external links in the future.
Low indexing and downgrading indicates that your content is of low quality. You are advised to spend more time on original content.
12. manual intervention
Such a phenomenon is generally only targeted at certain political words or hot buzzwords. There are very few interventions in ordinary small stations unless you are lucky enough.
13. Site downgrading due to an update Error
This phenomenon can only be complained by Baidu. If your site does not have any major problems, it will be solved very quickly.
Analysis of the most comprehensive reasons for downgrading websites in history
