I am uploading a file to the server. To do that I am using the SOAP Web Service that the developers of the site created.
This service CustomerWebService contains only one void method transferFile. In about 20-30 seconds after the upload I am getting the confirmation email from the site.
It works fine, however I would like to get at least HTTP 200 status right after the execution (like I see in Fiddler right away.)
How can I return one in code?
public ActionResult UploadFile(string fileName)
{
StreamReader sr = new StreamReader(fileName);
String line = sr.ReadToEnd();
CustomerWebService ws = new CustomerWebService ();
ws.transferFile("user", "password", line);
return Json("{Success}", JsonRequestBehavior.AllowGet);
}
Related
I have Developed ASP.net Core Web API & Web APP Which are in the same solution but different projects.
in the API I have some validations/checking as you may call.
e.g: if user email already exists, the API returns 'Email alreday in use' like this
bool EmailExists = dbContext.Users.Any(u => u.Email == user.Email);
if (EmailExists)
{
return new JsonResult("Email Address already taken!, Try a differen Email");
}
and so on. in some cases I may need to check multiple columns one a time, (eg: UserName, Email, TellNum)
This is an example of calling the API in the MVC
using (var client = new HttpClient())
{
client.BaseAddress = new Uri(_baseAPIUrl);
client.DefaultRequestHeaders.Clear();
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage Res = await client.PostAsJsonAsync("Users", user);
if (Res.IsSuccessStatusCode)
{
//in here I want check the `Res` and if it contains the returned messages, I want to display them by assigning it to `TempData[infoMsg]`
// else some something(register user)
}
// Check the returned JsonResult messages here if statusCode is ultered eg: BadRequest
}
My Question is how can I display these types of response messages in razor view in the MVC(Web App). in PostMan its workin, returning the response messages in body.
I did a lot of research about this but couldn't come to conclusion. I also cantacted some Devs I know(not .NET) and they said use JavaScript to call your API, which means I have to change almost everything I have done so far.
I aslo tried ultereing the statuCode to something like BadRequest in the API(if Email exists) in which case it will be checked outside the if (Res.IsSuccessStatusCode) of the Httpclient.
any help or direction is highly appreciated.
You should return a http error and a body containing some data about it eg field and message to your mvc controller. That could be a 422 error or whatever you like really since it's effectively internal and just coming back to the mvc controller.
The controller can then add any such error to modelstate and you can use the razor model "client" validation mechanism to show the error associated with a field.
This is therefore using the same mechanism used for attribute validation in the controller where you'd do
if (!ModelState.IsValid)
This is air code but will hopefully give you the idea.
[HttpPost]
public ActionResult PostUpdate(User u)
{
// call service and await response
var response = await httpClient.PostAsJsonAsync(posturi, u);
var returnContent = await response.Content.ReadAsAsync<ReturnContent>();
if (response.Result != HttpStatusCode.OK)
{
ModelState.AddModelError(returnContent.FieldName,returnContent.Error);
return Page();
}
// etc
You will want a more sophisticated checking on errors of course and check you get the body you're expecting.
Maybe you just hard code the field and error message if there's only one possibility. Maybe work with an array of fields and errors if there could be numerous validation fails.
I am not sure what is happening here.
When I run my web application locally and click a button to download a file, the file is downloaded fine and Response header as you can see in the attached screenshot where it says local.
But when I publish the application to azure web app. Somehow the download button stops working. I checked the Response Header and you can see the difference.
What would cause this problem? The code is the same? Is there any settings that I should be setting in azure web app in azure portal?
Updated to add code
I have debugged remotely to figure out what is going on as #Amor suggested.
It is so strange that When I debug on my local machine first ExportTo action gets hit which prepares the TempData then Download action gets called once the first action completed with ajax call.
However, this is not the case when I debug remotely. Somehow the ExportTo action never gets called. It directly calls the Download action. As a result the TempData null checking is always null.
But why? Why on earth and how that is possible? Is there something cached somewhere?
I have wiped the content of web application on the remote and re-publish evertyhing to ensure everything is updated. But still no success.
here is the code:
[HttpPost]
public virtual ActionResult ExportTo(SearchVm searchVm)
{
var data = _companyService.GetCompanieBySearchTerm(searchVm).Take(150).ToList();
string handle = Guid.NewGuid().ToString();
TempData[handle] = data;
var fileName = $"C-{handle}.xlsx";
var locationUrl = Url.Action("Download", new { fileGuid = handle, fileName });
var downloadUrl = Url.Action("Download");
return Json(new { success = true, locationUrl, guid = handle, downloadUrl }, JsonRequestBehavior.AllowGet);
}
[HttpGet]
public ActionResult Download(string fileGuid, string fileName)
{
if (TempData[fileGuid] != null)
{
var fileNameSafe = $"C-{fileGuid}.xlsx";
var data = TempData[fileGuid] as List<Company>;
using (MemoryStream ms = new MemoryStream())
{
GridViewExtension.WriteXlsx(GetGridSettings(fileNameSafe), data, ms);
MVCxSpreadsheet mySpreadsheet = new MVCxSpreadsheet();
ms.Position = 0;
mySpreadsheet.Open("myDoc", DocumentFormat.Xlsx, () =>
{
return ms;
});
mySpreadsheet.Document.Worksheets.Insert(0);
var image = Server.MapPath("~/images/logo.png");
var worksheet = mySpreadsheet.Document.Worksheets[0];
worksheet.Name = "Logo";
worksheet.Pictures.AddPicture(image, worksheet.Cells[0, 0]);
byte[] result = mySpreadsheet.SaveCopy(DocumentFormat.Xlsx);
DocumentManager.CloseDocument("myDoc");
Response.Clear();
//Response.AppendHeader("Set-Cookie", "fileDownload=true; path=/");
Response.ContentType = "application/force-download";
Response.AddHeader("content-disposition", $"attachment; filename={fileNameSafe}");
Response.BinaryWrite(result);
Response.End();
}
}
return new EmptyResult();
}
here is the javascript:
var exportData = function (urlExport) {
console.log('Export to link in searchController: ' + urlExport);
ExportButton.SetEnabled(false);
var objData = new Object();
var filterData = companyFilterData(objData);
console.log(filterData);
$.post(urlExport, filterData)
.done(function (data) {
console.log(data.locationUrl);
window.location.href = data.locationUrl;
});
};
When Export button is clicked exportData function is called:
var exportToLink = '#Url.Action("ExportTo")';
console.log('Export to link in index: '+exportToLink);
SearchController.exportData(exportToLink);
As I mentioned that this code works perfectly on the local machine. something weird is happening on azure webapp that ExportTo action breakpoint is never gets hit.
I am not sure what else I could change to get the ExportTo action hit?
Based on the Response Header of Azure Web App, we find that the value of Content-Length is 0. It means that no data has been sent from web app server side.
In ASP.NET MVC, we can response file using following ways.
The first way, send the file which hosted on server. For this way, please check whether the excel file has been uploaded to Azure Web App. You could use Kudu or FTP to the folder to check whether the file is exist.
string fileLocation = Server.MapPath("~/Content/myfile.xlsx");
string contentType = System.Net.Mime.MediaTypeNames.Application.Octet;
string fileName = "file.xlsx";
return File(fileLocation, contentType, fileName);
The second way, we can read the file from any location(database, server or azure storage) and send the file content to client side. For this way, please check whether the file has been read successfully. You can remote debug your azure web app to check whether the file content hasn't been read in the right way.
byte[] fileContent = GetFileContent();
string contentType = System.Net.Mime.MediaTypeNames.Application.Octet;
string fileName = "file.xlsx";
return File(fileContent, contentType, fileName);
5/27/2017 Update
Somehow the ExportTo action never gets called. It directly calls the Download action. As a result the TempData null checking is always null.
How many instances does your Web App assigned? If your Web App have multi instances, the ExportTo request is handled by one instance and the Download request is handled by another instance. Since the TempData is store in memory of dedicated instance, it can't be got from another instance. According to the remote debug document. I find out the reason why the ExportTo action never gets called.
If you do have multiple web server instances, when you attach to the debugger you'll get a random instance, and you have no way to ensure that subsequent browser requests will go to that instance.
To solve this issue, I suggest you response the data directly from the ExportTo action or save the temp data in Azure blob storage which can't be accessed from multi instances.
Firstly, I know there are multiple posts related to this error but nothing is helping so far.
I am getting an error "Cannot redirect after HTTP headers have been sent." in my MVC razor application when I make a call to SomeController.
How do I fix this?
[HttpPost]
public ActionResult SomeController(Object abc)
{
Helper.somemethod("","excel");
return View(abc);//I tried this
return RedirectToAction("SomeController"); //I tried this also
}
public static void somemethod(string settocken, string filenames, List<Sample> samples)
{
//Extra logic for excel that uses List<Sample> to generate excel.
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Cookies.Add(new HttpCookie("downloadToken", settocken));
HttpContext.Current.Response.ContentType = "Application/x-msexcel";
HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename={0}.xlsx", filenames));
using (MemoryStream ms = new MemoryStream())
{
try
{
book.Save(ms);
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}
catch
{
}
finally
{
}
HttpContext.Current.Response.End();
}
}
#CoolArchTek http communication loop will be ended after HttpContext.Current.Response.End() call, so you can't add anything after that, however as far as I know there is no possibility in http to do what you want, so I would recommend you render your view with javascript which will initiate file download by client's browser
I would suggest, have an iframe inside view where you want to redirect to and show the data. And set the excel file path(or the action which returns excel file) as source for that iframe.
With this, as soon as the page loads, download begins.
Hope it helps.
I've been trying to get the GetClientAccessToken flow to work with the latest release 4.1.0 (via nuget), where I'm in control of all three parties: client, authorization server and resource server.
The situation I have started to prototype is that of a Windows client app (my client - eventually it will be WinRT but its just a seperate MVC 4 app right now to keep it simple), and a set of resources in a WebAPI project. I'm exposing a partial authorization server as a controller in the same WebAPI project right now.
Every time (and it seems regardless of the client type e.g. UserAgentClient or WebServerClient) I try GetClientAccessToken, by the time the request makes it to the auth server there is no clientIdentifier as part of the request, and so the request fails with:
2012-10-15 13:40:16,333 [41 ] INFO {Channel} Prepared outgoing AccessTokenFailedResponse (2.0) message for <response>:
error: invalid_client
error_description: The client secret was incorrect.
I've debugged through the source into DNOA and essentially the credentials I'm establishing on the client are getting wiped out by NetworkCredential.ApplyClientCredential inside ClientBase.RequestAccessToken. If I modify clientIdentifier to something reasonable, I can track through the rest of my code and see the correct lookups/checks being made, so I'm fairly confident the auth server code is ok.
My test client currently looks like this:
public class AuthTestController : Controller
{
public static AuthorizationServerDescription AuthenticationServerDescription
{
get
{
return new AuthorizationServerDescription()
{
TokenEndpoint = new Uri("http://api.leave-now.com/OAuth/Token"),
AuthorizationEndpoint = new Uri("http://api.leave-now.com/OAuth/Authorise")
};
}
}
public async Task<ActionResult> Index()
{
var wsclient = new WebServerClient(AuthenticationServerDescription, "KieranBenton.LeaveNow.Metro", "testsecret");
var appclient = new DotNetOpenAuth.OAuth2.UserAgentClient(AuthenticationServerDescription, "KieranBenton.LeaveNow.Metro", "testsecret");
var cat = appclient.GetClientAccessToken(new[] { "https://api.leave-now.com/journeys/" });
// Acting as the Leave Now client we have access to the users credentials anyway
// TODO: CANNOT do this without SSL (turn off the bits in web.config on BOTH sides)
/*var state = client.ExchangeUserCredentialForToken("kieranbenton", "password", new[] { "https://api.leave-now.com/journeys/" });
// Attempt to talk to the APIs WITH the access token
var resourceclient = new OAuthHttpClient(state.AccessToken);
var response = await resourceclient.GetAsync("https://api.leave-now.com/journeys/");
string sresponse = await response.Content.ReadAsStringAsync();*/
// A wrong one
/*var wresourceclient = new OAuthHttpClient("blah blah");
var wresponse = await wresourceclient.GetAsync("https://api.leave-now.com/journeys/");
string wsresponse = await wresponse.Content.ReadAsStringAsync();
// And none
var nresourceclient = new HttpClient();
var nresponse = await nresourceclient.GetAsync("https://api.leave-now.com/journeys/");
string nsresponse = await nresponse.Content.ReadAsStringAsync();*/
return Content("");
}
}
I can't figure out how to prevent this or if its by design what I'm doing incorrectly.
Any help appreciated.
The NetworkCredentialApplicator clears the client_id and secret from the outgoing message as you see, but it applies it as an HTTP Authorization header. However, HttpWebRequest clears that header on the way out, and only restores its value if the server responds with an HTTP error and a WWW-Authenticate header. It's quite bizarre behavior on .NET's part, if you ask me, to suppress the credential on the first outbound request.
So if the response from the auth server is correct (at least, what the .NET client is expecting) then the request will go out twice, and work the second time. Otherwise, you might try using the PostParameterApplicator instead.
I am trying to integrate upload of arbitrary files to Google Docs into an existing application. This used to work before using resumable upload became mandatory. I am using Java client libraries.
The application is doing the upload in 2 steps:
- get the resourceId of the file
- upload the data
To get the resourceId I am uploading a 0-size file (i.e. Content-Length=0). I am passing ?convert=false in the resumable URL (i.e. https://docs.google.com/feeds/upload/create-session/default/private/full?convert=false).
I am passing "application/octet-stream" as content-type. This seems to work, though I do get different resourcesIds - "file:..." resourceIds for things like images, but "pdf:...." resourceIds for PDFs.
The second step constructs a URL based on the resourceId obtained previously and performs a search (getEntry). The URL is in the form of https://docs.google.com/feeds/default/private/full/file%3A.....
Once the entry is found the ResumableGDataFileUploader is used to update the content (0-byte file) with the actual data from the file being uploaded. This operation fails with 401 Unauthorized response when building ResumableGDataFileUploader instance.
I've tried with ?convert=false as well as ?new-revision=true and both of these at the same time. The result is the same.
The relevant piece of code:
MediaFileSource mediaFile = new MediaFileSource(
tempFile, "application/octet-stream");
final ResumableGDataFileUploader.Builder builder =
new ResumableGDataFileUploader.Builder(client, mediaFile, documentListEntry);
builder.executor(MoreExecutors.sameThreadExecutor());
builder.requestType(ResumableGDataFileUploader.RequestType.UPDATE);
// This is where it fails
final ResumableGDataFileUploader resumableGDataFileUploader = builder.build();
resumableGDataFileUploader.start();
return tempFile.length();
The "client" is an instance of DocsService, configured to use OAuth. It is used to find "documentListEntry" immediately before the given piece of code.
I had to explicitly specify request type, since it seems the client library code contains a bug causing NullPointerException for "update existing entry" case.
I have a suspicion that the issue is specifically in the sequence of actions (upload 0-byte file to get the resourceId, then update with actual file) but I can't figure out why it doesn't work.
Please help?
This code snippet works for me using OAuth 1.0 and OAuth 2.0:
static void uploadDocument(DocsService client) throws IOException, ServiceException,
InterruptedException {
ExecutorService executor = Executors.newFixedThreadPool(10);
File file = new File("<PATH/TO/FILE>");
String mimeType = DocumentListEntry.MediaType.fromFileName(file.getName()).getMimeType();
DocumentListEntry documentEntry = new DocumentListEntry();
documentEntry.setTitle(new PlainTextConstruct("<DOCUMENT TITLE>"));
int DEFAULT_CHUNK_SIZE = 2 * 512 * 1024;
ResumableGDataFileUploader.Builder builder =
new ResumableGDataFileUploader.Builder(
client,
new URL(
"https://docs.google.com/feeds/upload/create-session/default/private/full?convert=false"),
new MediaFileSource(file, mimeType), documentEntry).title(file.getName())
.requestType(RequestType.INSERT).chunkSize(DEFAULT_CHUNK_SIZE).executor(executor);
ResumableGDataFileUploader uploader = builder.build();
Future<ResponseMessage> msg = uploader.start();
while (!uploader.isDone()) {
try {
Thread.sleep(100);
} catch (InterruptedException ie) {
throw ie; // rethrow
}
}
DocumentListEntry uploadedEntry = uploader.getResponse(DocumentListEntry.class);
// Print the document's ID.
System.out.println(uploadedEntry.getId());
System.out.println("Upload is done!");
}