Http Bad Request 400 Error
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protocol completely. So the Web server was unable to understand the request and process it. It almost always means bad programming of the client system and/or the Web server. Fixing 400 errors - general There is a low-level problem in the client or the Web how to fix error 400 server or both. 95% of the time this is because of a problem on the client system 400 bad request nginx e.g. there is something unstable on your PC running the Web browser. Is your PC secure ?. If your PC is not well-protected, then all 400 bad request request header or cookie too large kinds of problems may occur - including HTTP 400 errors. If you run Windows, stay uptodate with automatic security updates from Microsoft and possibly consider getting a registry cleaner. Always have good anti-virus and spyware protection. Invest in a hardware firewall if bad request 400 fitbit you can afford one. Be sensible surfing the Web - block pop-up windows and avoid bad sites. If your PC security is compromised, then Web traffic out from your PC to the Internet may be secretly corrupted by malware (spyware, viruses, etc.) running on your PC. This can be difficult for you to detect. Have you installed web-based software ?. Some social networking and games sites ask you to download and run software on your PC so you can interact with other people on the
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Internet directly (without using your Web browser). This software, if badly written or even criminal, can corrupt all HTTP traffic from your PC. Getting rid of that defective software can be difficult. At worst you may have to reinstall your operating system again (possibly losing all your personal data on your PC if you do not have backup). How stable is your Internet connection ?. If you have recently changed ISPs or your ISP is very slow or unreliable, then Web traffic from your PC out to any site on the Internet may be corrupt. Your ISP may have reconfigured some of their setup (e.g. introduced new proxy servers or cacheing) that is causing some instability. A possible sign of problems here is if you can not easily browse the Web site of your ISP. You can also try to check that the Web site you are actually visiting is the one you think you are visiting. For example, you may have a DNS problem. You can check this using a ‘ping’ test. A DNS problem may be caused by your ISP or may be on your own system e.g. in a ‘hosts’ file. Do you get the error on more than one Web site ?. If you get the error on lots of Web sites, this indicates the problem is on your PC, not on those sites. Do you get the error using more than one browser ?. If you have two or more Web browsers installed on your PC and t
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LaingJanuary 29, 20095 Share 0 0 After sending an HTTP request to an IIS server, an HTTP client (such as Internet Explorer) may display the following type of error message in the browser window: If Internet Explorer’s Friendly HTTP Error https://blogs.msdn.microsoft.com/webtopics/2009/01/29/how-to-troubleshoot-http-400-errors/ Messages option is turned off, the error may resemble the following: In these scenarios, IIS has rejected the client’s HTTP request because it did not meet the server’s parsing rules, or it exceeded time limits, or failed some other rule that IIS requires incoming requests to adhere to. IIS sends the HTTP 400 – Bad Request status back to the client, and then terminates the TCP connection. bad request Troubleshooting When troubleshooting an HTTP 400 condition, it is important to remember that the underlying problem is that the client has sent a request to IIS that breaks one or more rules that HTTP.sys is enforcing. With that in mind, you will want to see exactly what the client is sending to IIS; to do this, capture a network trace of the client sending the bad request. You can analyze the trace to see the raw data that the client bad request 400 sends to IIS, and to see the raw response data that IIS sends back to the client. You can also use an HTTP sniffer tool called Fiddler; this is a great tool as it allows you to see the HTTP headers even if the client and server are communicating over SSL. The next data item you will want to use is the httperr.log file. Beginning in IIS 6.0, the HTTP.sys component handles incoming HTTP requests before they are passed along to IIS, and is the component responsible for blocking requests that don’t meet the IIS requirements. When HTTP.sys blocks the request, it will log information to its httperr.log file concerning the bad request. NOTE: For more information on the HTTP API error logging that HTTP.sys provides, see the following article: Error logging in HTTP API http://support.microsoft.com/?id=820729 It is technically possible, although not very likely, that a client will receive an HTTP 400 response which does not have an associated log entry in the httperr.log. This could happen if an ISAPI filter or extension or an HTTP module in IIS sets the 400 status, in which case you could look at the IIS log for more information. It could also happen if an entity between the client and the server, such as a proxy server or other network device, intercepts a response from IIS and overrides it with its own 400 status and/or “Bad Request” error