Http Error 400 Iis 7.5
Server Web App Gallery Microsoft Azure Tools Visual Studio Expression Studio Windows Internet Explorer WebMatrix Web Platform Installer Get Help: Ask a Question in our Forums More Help Resources Blogs Forums HomeLearnTroubleshootChapter 4. Diagnosing HTTP ErrorsTroubleshooting HTTP 400 Errors in IIS Troubleshooting HTTP 400 Errors in IIS By Mike LaingNovember 27, 2012Tools Used in this Troubleshooter: Network Monitor HTTP Error logging This material is provided for informational purposes only. Microsoft makes no warranties, express or implied. Overview After sending an HTTP request to an IIS server, an HTTP client (such as Internet Explorer) may display the following type of error message: The webpage cannot be found. HTTP 400 Most likely causes: There might be a typing error in the address. If you clicked on a link, it may be out of date. What you can try: Retype the address. Go back to the previous page. Go to Bing and look for the information you want. If the HTTP client is Internet Explorer, and the Show Friendly HTTP Error Messages option is turned off, the error may resemble the following: Bad Request In these scenarios, IIS has rejected the client's HTTP request because the request did not meet the server's HTTP parsing rules, or it exceeded time limits, or failed some other rule that IIS or HTTP.sys require incoming requests to adhere to. IIS sends the HTTP 400 - Bad Request status back to the client, and then terminates the TCP connection. Troubleshooting Methods 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 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 C:\Windows\System32\LogFiles\HTTP
Error 400: Bad Request The HTTP ‘Error 400: Bad Request’ typically occurs when a web server receives a request that it is unable to understand. The cause of this is often malformed syntax. If the request contains syntax that doesn’t conform to the HTTP protocol, the server will generate the 400 error. The request should not be re-sent without modifications. The 400 Error occurs whenever the HTTP search cycle is terminated by the web server. As a result, the client is not granted access to the particular information it requested. This is often because the https://www.iis.net/learn/troubleshoot/diagnosing-http-errors/troubleshooting-http-400-errors-in-iis request does not adhere to the rules listed under the hypertext transfer protocol. Consequently, the client receives a HTTP status code and data stream transmitting the ‘400′ error. How Does The HTTP Cycle Flow? When a client such as a web browser requests a http resource, it goes through the following process: The client receives the IP address for the respective domain as you request, using the https://www.helpdesksoftware.biz/400-bad-request/ DNS system. An IP socket connection is opened to that IP address. Then HTTP data stream is sent as a request through that socket by the client. This request is obtained by the web server, which sends a relevant reply as a HTTP data stream which contains status codes and other data. The web client receives the reply and displays the results. This video provides an visualization of the data flow - http://www.youtube.com/watch?v=Pdqss2GvU5M. Different browsers display different amounts of information regarding the 400 Bad Request error. By default, Internet Explorer shows much more detail than other browsers, and it actually suggests possibilities for the cause of the error. For example, if you open a url that triggers a 400 Bad Request error in Internet Explorer, it will display the message below: If Internet Explorer shows a message with no description of the 400 Bad Request error, as below, that means that the “Show friendly http error message” option is disabled. To re-enable it, click on ‘Settings’, and go to the ‘Advanced’ tab. Put a tick in the “Show friendly http error message” box. Mozilla Firefox and Google Chrome will not show much information in contrast to Internet Explorer. The ima
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow http://stackoverflow.com/questions/20695195/iis7-5-400-bad-request-when-a-url-includes-character the company Business Learn more about hiring developers or posting ads with us Stack Overflow http://www.getnetgoing.com/HTTP-400.html Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up IIS7.5 400 Bad request when a URL includes character : up vote 0 down vote favorite I am http error using ARR and ISAPI with IIS7.5. Whenever forwarding URL including specific character : 400 Bad request occurs. How can I solve it? I guess there is no problem in ARR and ISAPI because no problem in development server(same Env as operating server) it only occurs in operating server. iis http-status-code-400 share|improve this question edited Dec 20 '13 at 2:34 abatishchev 57.1k56214353 asked Dec 20 '13 at 2:14 Seongjae Joung 164 add a comment| http error 400 2 Answers 2 active oldest votes up vote 1 down vote The : character is only permitted in URLs as part of an IPv6 address. Either encode it as %3A, or don't use it. You can find the reference in RFC3986 share|improve this answer answered Dec 20 '13 at 2:19 user1864610 add a comment| up vote 1 down vote By default IIS 7.5 rejecects certain characters in the path -- the default is the follwing comma separated list: <,>,*,%,&,:,\\. If a request hits that list it will return a http 400 error as the request is bad insofar as the server is configured. See this blog post and this MSDN page for a little background. Specifically, you'll likely want to update the httpRuntime configuration to something like:
of a request that it received. Outline: Symptoms Causes and Solutions Extra information Footnotes Symptoms Internet Explorer may report this as “The webpage cannot be found” Microsoft Windows Update reports HTTP 400 errors with error code 0x80244016 (hexadecimal 80244016). Apache web servers report this as: Bad Request Your browser sent a request that this server could not understand. Microsoft IIS web servers provide extended error codes 400.1 to 400.9. For details, see Microsoft Knowledge Base article 943891: “The HTTP status codes in IIS 7.0” Google servers may report HTTP 400 errors in several ways, e.g.: By accessing http://www.google.com/reader/view/null: Google Error Client Error There was an error in your request. By accessing http://www.google.com/history/feeds/default/subscriptions/browser (when you haven't subscribed to Google's browser history feature): Google Error Bad Request Your client has issued a malformed or illegal request. Image from http://www.flickr.com/photos/apelad/ Causes and Solutions The official description of what causes HTTP 400 errors is very broad: “The request could not be understood by the server due to malformed syntax.&rdquo In turn, that can have several causes: Bad server name When the server indicates “Bad Request (Invalid Hostname)”: The website name may lead to a web hosting server that no longer serves the web site with that name. If there are multiple sites listed in the “Other Website On” section at the bottom of http://www.websiteoutlook.com, then the server is probably part of a web hosting site. This can happen when the owner of a web site ends an agreement with a web hosting service, but has not updated information about their site from the Domain Name System (DNS). Two things that you can do are: Clear your DNS cache by opening a Command Prompt Type ipconfig /flushdns (See this page if you need to fix a “The requested operation requires elevation” error) Restart your web browser. This will force your system to check the current mapping between the name of the server that you are after and the address of its server, and may ensure that you are using the current server. Try checking for an archived copy of the object, e.g. by entering the address in The Internet Archive Wayback Machine. Microsoft IIS web servers may report this situation with a HTTP 404.1 error. Header line too long The requests and responses that flow between a web browser and web server include header lines that define the type of