Error 417 Http
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just like you, helping each other. Join them; it only takes a minute: Sign up HTTP POST Returns Error: 417 “Expectation Failed.” up vote 175 down vote favorite 49 When I try to POST to a URL
Http Error 415
it results in the following exception: The remote server returned an error: (417) Expectation Failed. Here's a sample code: var client = new WebClient(); var postData = new NameValueCollection(); postData.Add("postParamName", "postParamValue"); byte[] responseBytes = client.UploadValues("http://...", postData); string response = Encoding.UTF8.GetString(responseBytes); // (417) Expectation Failed. Using an HttpWebRequest/HttpWebResponse pair or an HttpClient doesn't make a difference. What's causing this exception? c# .net http http-post webclient share|improve this question edited May 31 at 16:44 asked Feb 19 http error 416 '09 at 17:57 Saeb Amini 8,47643137 2 The issue seems to happen when your application communicates through a proxy server. A .NET application I wrote worked when it was directly connected to internet but not when it was behind a proxy server. –Salman A May 24 '12 at 12:01 2 Observed this condition when a client is running through a HTTP 1.0 (only) proxy server. The client (asmx proxy without any configuration) is sending a HTTP 1.1 request and the proxy (before any server could ever get involved) then rejects what the proxy sends on. Should an end-user have this issue, using the config solution below is an appropriate workaround as it would cause requests to be generated without a reliance on the proxy understanding the Expect header which by default gets added as Expect100Continue is true by default. –Ruben Bartelink Jun 6 '12 at 13:18 add a comment| 7 Answers 7 active oldest votes up vote 392 down vote accepted System.Net.HttpWebRequest adds the header 'HTTP header "Expect: 100-Continue"' to every request unless you explicitly ask it not to by setting this static property to false: System.Net.ServicePointManager.Expect100Continue = false; Some servers choke on that header and send back the 417 error you're seeing. Give that a shot. share|improve this answer answered Feb 19 '09 at 19:45 xcud 10k32426 6
referer DNT X-Forwarded-For Status codes 301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons v t e This is a list of Hypertext Transfer Protocol http error 413 (HTTP) response status codes. It includes codes from IETF internet standards, other IETF http error 414 RFCs, other specifications, and some additional commonly used codes. The first digit of the status code specifies one of five classes http error 402 of response; an HTTP client must recognise these five classes at a minimum. The phrases used are the standard wordings, but any human-readable alternative can be provided. Unless otherwise stated, the status code http://stackoverflow.com/questions/566437/http-post-returns-error-417-expectation-failed is part of the HTTP/1.1 standard (RFC 7231).[1] The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes.[2] Microsoft IIS sometimes uses additional decimal sub-codes to provide more specific information,[3] but not all of those are here (note that these sub-codes only appear in the response payload and in documentation; not in the place of an actual HTTP status code). Contents 1 1xx Informational https://en.wikipedia.org/wiki/List_of_HTTP_status_codes 2 2xx Success 3 3xx Redirection 4 4xx Client Error 5 5xx Server Error 6 Unofficial codes 6.1 Internet Information Services 6.2 nginx 6.3 CloudFlare 7 See also 8 Notes 9 References 10 External links 1xx Informational[edit] Request received, continuing process. This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. Since HTTP/1.0 did not define any 1xx status codes, servers must not[note 1] send a 1xx response to an HTTP/1.0 client except under experimental conditions.[4] 100 Continue The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request's headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. The response 417 Expectation Failed indicates the request should not be continued.[2] 101 Switching Protocols The requester has asked t
Articles Technical Blogs Posting/Update Guidelines Article Help Forum Article Competition Submit an article or tip Post your Blog quick answersQ&A Ask a http://www.codeproject.com/Articles/94235/The-request-failed-with-HTTP-status-Expectatio Question about this article Ask a Question View Unanswered Questions https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html View All Questions... C# questions Linux questions ASP.NET questions SQL questions VB.NET questions discussionsforums All Message Boards... Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL http error / STL Managed C++/CLI C# Free Tools Objective-C and Swift Database Hardware & Devices> System Admin Hosting and Servers Java .NET Framework Android iOS Mobile SharePoint Silverlight / WPF Visual Basic Web Development Site Bugs / Suggestions Spam and Abuse Watch features Competitions News The Insider Newsletter The Daily Build Newsletter Newsletter archive Surveys Product error 417 http Showcase Research Library CodeProject Stuff communitylounge Who's Who Most Valuable Professionals The Lounge The Insider News The Weird & The Wonderful The Soapbox Press Releases Non-English Language > General Indian Topics General Chinese Topics help What is 'CodeProject'? General FAQ Ask a Question Bugs and Suggestions Article Help Forum Site Map Advertise with us About our Advertising Employment Opportunities About Us Articles » Desktop Development » Status Bar » General Technical BlogView BlogBrowse CodeStatsRevisions (3)Alternatives Comments (9) Add your ownalternative version Tagged as C#Windows Stats 100.5K views8 bookmarked Posted 14 Jul 2010 The request failed with HTTP status 417: Expectation failed mrt_doulaty, 15 Jul 2010 CPOL 5.00 (10 votes) 1 2 3 4 5 5.00/5 - 10 votesμ 5.00, σa 1.10 [?] Rate this: Please Sign up or sign in to vote. The request failed with HTTP status 417: Expectation failed When using WebServices and calling some Web Methods, you may come across this exception: The request failed w
response. 10.1 Informational 1xx This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. There are no required headers for this class of status code. Since HTTP/1.0 did not define any 1xx status codes, servers MUST NOT send a 1xx response to an HTTP/1.0 client except under experimental conditions. A client MUST be prepared to accept one or more 1xx status responses prior to a regular response, even if the client does not expect a 100 (Continue) status message. Unexpected 1xx status responses MAY be ignored by a user agent. Proxies MUST forward 1xx responses, unless the connection between the proxy and its client has been closed, or unless the proxy itself requested the generation of the 1xx response. (For example, if a proxy adds a "Expect: 100-continue" field when it forwards a request, then it need not forward the corresponding 100 (Continue) response(s).) 10.1.1 100 Continue The client SHOULD continue with its request. This interim response is used to inform the client that the initial part of the request has been received and has not yet been rejected by the server. The client SHOULD continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The server MUST send a final response after the request has been completed. See section 8.2.3 for detailed discussion of the use and handling of this status code. 10.1.2 101 Switching Protocols The server understands and is willing to comply with the client's request, via the Upgrade message header field (section 14.42), for a change in the application protocol being used on this connection. The server will switch protocols to those defined by the response's Upgrade header field immediately after the empty line which terminates the 101 response. The protocol SHOULD be switched only when it is advantageous to do so. For example, switching to a newer version of HTTP is advantageous over older versions, and switching to a real-time, synchronous protocol might be advantageous when delivering resources that use such features. 10.2 Successful 2xx This class of status code indicates that the client's request was successfully received, understood, and accepted. 10.2.1 200 OK The request has succeeded. The information returned with the response is dependent on the method used in the request, for example: GET an entity corresponding to the requested