HTTP 502 Error, What does 502
HTTP Error 502 Bad gateway
Introduction
A server (not needfully a Webserver) is working as a proxy or gateway to fulfill the request of the client (e.g. our Web browsers or our CheckUpDown robots) to entree the requested URL. That server got an invalid result from an upriver server it accessed to fulfill the requests.
This usually doesn't mean that the upstream servers are down (no responses to the gateway or proxy), but rather than that the upstream servers and the gateway or proxy don't agree on the exchanging data protocols. Provided that Internet protocol is quite clear, that often mean that one or both machine have been incompletely or incorrectly programmed.
502 Error Code Explained
So the server, while working as a gateway/proxy, got any invalid
response from the upstream servers it accessed in the try to complete
the requests.
502 errors in the HTTP cycle
Few clients (e.g. our Web browsers or our CheckUpDown robots) goes through the given below cycle when it communicate with the Webservers:
Obtaining the IP addresses from the name of IP of the website (the website URL which leading without the 'http://'). This look up (conversions of the name of IP to the address of IP) is given by domain name servers (DNSs).
Now Open an socket connection of IP to that IP addresses.
Type an HTTP data streams via that socket.
Get an HTTP data stream back from the Webservers as response. This data stream includes the codes of status whose value is determined by the HTTP protocols. Need to Parse this data stream for status codes and another helpful info.
This error generates in the last step above when the client gets an HTTP status code that it recognizes as '502'.
Why it occurs
A servers are working as a proxy or gateway to fulfill the request
by the clients, for accessing the requested URLs. The error generates
When such server gets any invalid response from an upstream servers
it accessed to fulfill the requests. This usually doesn't mean that
the upstream servers are down , but rather than that the upstream
servers and the gateway or proxy don't accept on the protocols for
exchanging the records.
General - Fixing 502 errors
Such problems are due to bad IP communications between back end PCs, possibly containing the Webservers at the website we are trying to browse. Before analyzing such problem, we should completely clear the cache of browser.
If we are surfing the Website and face this problem for all Websites we try to browse, then either i) that ISP has a major equipment failure or overload or ii) there is something problem with that internal Internet connections e.g. that firewall is not functioning properly. In the first case, only that ISP can help us. In the 2nd case, we require to fix whatever it is that is forestalling us reaching the Internet.
If we get such problems for only some of the Websites what we try to browse then it is likely to be a problems with those websites i.e. one of their equipment pieces are failing or overloaded. Now Contact the people at such websites.
Fixing 502 errors - CheckUpDown
Use of caching and proxies are increasing on the Website. Our CheckUpDown robots will always attempt to 'drill through' to the actual PC that really hosts the Website, but we don't have fulfill power over where our HTTP requests actually finished. If any one link from the chains of PCs dealing with our HTTP requests are ends up, then an error like as 502 can simply generates.Fixing 502 error code
Both the upstream and proxy servers should be programmed
completely and accurately. The IP communications between the back end
PCs should be perfect. Before analyzing such problems, we should
clear our browsers cache properly. If we see such problems for all
the websites we visit,then either 1) our ISP has a major equipment
failure or overload or 2) there is something vanish with our internal
Internet connections e.g. our firewall is not working properly. So as
per first case, only our ISP can help us. In the 2nd case, we require
to fix whatever it is that is stopping us reaching to the Internet.
If we have been registered with 100 pulse, our website will be
managed and we will be well-known by any emails or a short message
services when 502 status code errors generates.
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