In the era of rapid development of the Internet, coupled with the high cost of bidding to make most enterprises miserable so low-cost investment in the occupation-seo was born, the number of practitioners are also increasing each year, but the internet more and more spam information, so the search engine in order to better cater to user experience also frequently expanded the algorithm adjustment. During this period of course there are many sites have been down or even k off, for what reason, there are many from the professional friends can not thoroughly find the root of the problem, the following author of personal years of experience for everyone to start sharing, hope to help you to restore the site rankings at an early date.
Go straight to the chase:
I. Space issues
Because of the speed of space access is not stable, sometimes slow to open the situation, because this is the right to drop the case is also a lot of. Therefore, I recommend this site before you do not covet cheap and buy a cheap space, and to choose a secure and fast domestic space. Want to know if your site in the last update when the situation is not open to see the space log, here I compiled the search engine common crawl return code.
A 1xx (temporary response) represents a temporary response and requires a status code for the requester to continue the operation.
100 (continued) The requesting person shall continue to make the request. The server returns this code to indicate that the first part of the request was received and is waiting for the remainder.
101 (switching protocol) The requestor has asked the server to switch protocols, and the server has confirmed and is ready to switch.
2XX (Success) indicates the status code of the request was successfully processed.
200 (success) The server has successfully processed the request. Typically, this indicates that the server provided the requested Web page.
201 (created) The request was successful and the server created a new resource.
202 (accepted) the server has accepted the request but has not yet processed it.
203 (non-authoritative information) the server has successfully processed the request, but the information returned may be from another source.
204 (no content) the server successfully processed the request, but did not return any content.
205 (reset content) the server successfully processed the request, but did not return any content.
206 (partial) The server successfully processed a partial GET request.
3xx (redirect) indicates that further action is required to complete the request. Typically, these status codes are used for redirection.
300 (multiple options) for requests, the server can perform a variety of operations. The server can select an action based on the requestor (user agent) or provide a list of actions for the requestor to select.
301 (permanently moved) The requested page has been permanently moved to a new location. When the server returns this response (a response to a GET or HEAD request), the requestor is automatically forwarded to the new location.
302 (Temporary move) The server is currently responding to requests from a Web page in a different location, but the requestor should continue to use the original location for future requests.
303 (View other locations) The server returns this code when the requestor should use a separate GET request for the different locations to retrieve the response.
304 (not modified) The requested webpage has not been modified since the last request. When the server returns this response, the Web page content is not returned.
305 (using a proxy) the requestor can only use the proxy to access the requested Web page. If the server returns this response, it also indicates that the requestor should use the proxy.
307 (Temporary redirect) The server is currently responding to requests from a Web page in a different location, but the requestor should continue to use the original location for future requests.
4xx (Request error) These status codes indicate a possible error in the request and hinder the processing of the server.
400 (Error request) The server does not understand the syntax of the request.
401 (unauthorized) request authentication is required. The server may return this response for pages that need to log on.
403 (Forbidden) The server rejects the request. 404 (not found) The requested Web page was not found by the server.
405 (method Disabled) Disables the method specified in the request.
406 (not accepted) cannot use the requested content attribute to respond to the requested Web page.
407 (requires proxy authorization) This status code is similar to 401 (unauthorized), but specifies that the requestor should authorize the use of the proxy. 408 (Request timed out) A timeout occurred while the server was waiting for a request.
409 (conflict) The server has a conflict when it finishes the request. The server must include information about the conflict in the response.
410 (Deleted) If the requested resource has been permanently deleted, the server returns this response.
411 (requires valid length) The server does not accept requests that do not contain a valid Content-Length header field.
412 (precondition not met) the server does not meet one of the prerequisites set by the requestor in the request.
413 (Request entity too Large) The server cannot process the request because the request entity is too large to exceed the processing power of the server.
414 (The requested URI is too long) The requested URI (usually the URL) is too long for the server to process.
415 (Unsupported media type) The requested format is not supported by the requested page.
416 (The request scope does not meet the requirements) if the page cannot provide the requested scope, the server returns this status code.
417 (unmet expectations) the server does not meet the requirements for the expected Request header field.
5XX (server error) These status codes indicate that the server has an internal error while trying to process the request. These errors may be the error of the server itself, not the request.
500 (server internal error) the server encountered an error and could not complete the request.
501 (not yet implemented) the server does not have the capability to complete the request. For example, this code may be returned when the server does not recognize the request method.
502 (Error Gateway) The server receives an invalid response from the upstream server as a gateway or proxy.
503 (Service Unavailable) the server is not currently available (due to overloading or downtime maintenance). Typically, this is only a temporary state.
504 (Gateway Timeout) The server acts as a gateway or proxy, but does not receive requests from the upstream server in a timely manner.
505 (HTTP version not supported) the HTTP protocol version used in the request is not supported by the server.
Second, friendship chain points or other sites in the same space down the right
1, Friendship link site is down right immediately delete this site in exchange for an industry-related high-level website connection
2, the same space other sites down the right to replace the independent space
Third, the site content
Low originality, long time not updated, more for acquisition or pseudo-original content, enhance content quality and update
Iv. too much code affects web page opening speed
Use Baidu Webmaster tools to delete the excessive miscellaneous code in the station
Five, the site is mirrored
There are a lot of website code is not processed in absolute address way, competitors often like to use this point mirror their own site was down right.
Six, the homepage is blocked
This phenomenon is mainly aimed at Baidu, the solution directly to the server's main header index modified to other pages or the first page of the file name revision.
Vii. Over-optimization
Some friends on the site of the optimization of this degree is not very good, the use of means are used, the result is not only the ranking is not good, but counterproductive, the specific degree how to grasp, there is no destiny, can only be said to go through a lot of practice and operation of the area to summarize some rules or skills.
Eight recent changes in the station's three major labels
Recently changed the title of the homepage, keywords and description or frequent changes and so on.
Nine, page keyword heap removal density is too high
This phenomenon is easy to be mistaken for the search engine cheating, but often some seor do not pay attention to, often appear throughout the page everywhere appear to do keyword, in fact, in the current user experience-based today we have to do the key word layout to natural, do not go to heap Beecher.
Ten, the website is Hung horse
This phenomenon is also very common, so we should always pay attention to their own site snapshots, home page source code and changes to prevent in the first.
Xi. a sudden and significant decline in the chain or inclusion
The chain suddenly reduced a lot of the main reason is because your site's external connection quality is not high, the search engine in the update to adjust the time of your those connections to the junk connection and deleted, so in the future we do in the chain to be used for some high correlation connection.
Inclusion drop indicates that your content quality is low suggest more work on the original content.
12. Manual Intervention
This phenomenon is generally only for some political words or super-hot words, ordinary station is very little intervention, unless you are lucky.
13, the update error causes the website to be down right
This phenomenon can only go to Baidu complaints, if your site does not have a big problem will be solved soon.
