![]() #Fields: date time c-ip c-port s-ip s-port cs-version cs-method cs-uri sc-status s-siteid s-reason s-queuename The next step is to look at the httperr.log file for the entry that corresponds to the bad request: You’ll notice that the response headers don’t tell us as much as the error message in the browser. HTTP: Data: Number of data bytes remaining = 63 (0x003F) HTTP: Response to Client HTTP/1.1 Status Code = 400 - Bad Request HTTP: Data: Number of data bytes remaining = 14 (0x000E) When the client sends its request, the browser error it gets back looks like this:Ĭapturing a network trace of the request and response, we see the following raw request/response headers: 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.įollowing is an example of an HTTP 400 scenario, where a client sends a bad request to IIS and the server sends back an HTTP 400 – Bad Request message. 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 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. NOTE: For more information on the HTTP API error logging that HTTP.sys provides, see the following article: When HTTP.sys blocks the request, it will log information to its httperr.log file concerning the bad request. 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. The next data item you will want to use is the httperr.log file. 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. You can analyze the trace to see the raw data that the client sends to IIS, and to see the raw response data that IIS sends back to the client. 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. ![]() ![]() 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. IIS sends the HTTP 400 – Bad Request status back to the client, and then terminates the TCP connection. 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. If Internet Explorer’s Friendly HTTP Error Messages option is turned off, the error may resemble the following: It doesn’t end there we can further improve the error handling in our application.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: This version of viewRecord is the same length as the original,īut now each of those lines has specific meaning and we are providing a ![]() Here is the interface’s declaration: type error interface Value that can describe itself as a string. You can get a lot done in Go knowing just this about the error type,īut in this article we’ll take a closer look at error and discuss some If an error occurs it calls log.Fatal to print the error message and stop. The following code uses os.Open to open a file. func Open(name string) (file *File, err error) Go code uses error values to indicate an abnormal state.įor example, the os.Open function returns a non-nil error value when If you have written any Go code you have probably encountered the built-in error type.
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