Unexpected end of Stream, the content may have already been read by another component. Microsoft.AspNetCore.WebUtilities.MultipartReaderStream

Question

I get an exception when I try to read multi part content from the request saying the content may have already been read by another component.

 if (MultipartRequestHelper.IsMultipartContentType(Request.ContentType))
            {
                // Used to accumulate all the form url encoded key value pairs in the 
                // request.
                var formAccumulator = new KeyValueAccumulator();

                var boundary = Request.GetMultipartBoundary();
                var reader = new MultipartReader(boundary, HttpContext.Request.Body);
                var section = await reader.ReadNextSectionAsync();
                while (section != null)
                {
                    ContentDispositionHeaderValue contentDisposition;
                    var hasContentDispositionHeader =
                        ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out contentDisposition);
                }
            }

Learner · Accepted Answer · 2019-11-15 00:34:33Z

39

In asp.net core 3, You have to add factories.RemoveType<FormFileValueProviderFactory>(); to your DisableFormValueModelBindingAttribute attribute.

Code

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DisableFormValueModelBindingAttribute : Attribute, IResourceFilter
{
    public void OnResourceExecuting(ResourceExecutingContext context)
    {
        var factories = context.ValueProviderFactories;
        factories.RemoveType<FormValueProviderFactory>();
        factories.RemoveType<FormFileValueProviderFactory>();
        factories.RemoveType<JQueryFormValueProviderFactory>();
    }

    public void OnResourceExecuted(ResourceExecutedContext context)
    {
    }
}

Documentation

answered Nov 15, 2019 at 0:34

Learner

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1 Comment

Techie Over a year ago

This answer is useful and helped me while working on the DotNet core migration from 2.2 to 3.1. My API worked after added FormFileValueProviderFactory. Thanks :)

Sunil Buddala · Accepted Answer · 2018-04-16 22:47:02Z

24

It turns out that I had to disable form value model binding by using the attribute below.

[HttpPost]
    [Route("")]
    [DisableFormValueModelBinding]
    public async Task<IActionResult> Post()

The attribute implementation is below

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DisableFormValueModelBindingAttribute : Attribute, IResourceFilter
{
    public void OnResourceExecuting(ResourceExecutingContext context)
    {
        var factories = context.ValueProviderFactories;
        factories.RemoveType<FormValueProviderFactory>();
        factories.RemoveType<JQueryFormValueProviderFactory>();
    }

    public void OnResourceExecuted(ResourceExecutedContext context)
    {
    }
}

answered Apr 16, 2018 at 22:47

Sunil Buddala

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5 Comments

Ole K Over a year ago

I have like disabled every single factory by using ValueProviderFactories.RemoveType<T>() but its still giving me the Unexpected error

Aaron Over a year ago

Yep, solved for me. It's because the DisableFormValueModelBinding custom filter allows us to prevent the method from trying to bind and validate the input automatically which would preemptively read the input stream. This allows us to later use MultipartReader to parse the request.Body. Useful reference; blog.bitscry.com/2018/03/12/…

Enthus3d Over a year ago

This answer helped me resolve an issue where I try to use bindings with UploadFilesAsync(String cst, String data, String device), before the multipart would throw exceptions due to being preempted by the bindings. Now it works as intended. Thanks!

Ahmad Over a year ago

how we disable DisableFormValueModelBinding while working in middleware startup.cs class . working in .net core 2.2 ?

Trace Over a year ago

I used attribute [FromForm] and got the error, which makes sense. Before i reach the line var reader = new MultipartReader(boundary, request.Body);and var section = await reader.ReadNextSectionAsync(); the attribute forced to open stream and exception will be thrown. If i use [FromQuery] same error, but i am a little bit confused why it happens too? But solution worked for me! Thanks!

Rae · Accepted Answer · 2020-05-28 05:50:53Z

7

In my specific case, I was using a multipart boundary value which didn't exist in the payload being parsed by the MultipartReader:

// multipartBoundary is not in the contents of httpResponseContentStream.
var multipartBoundary = "batchresponse_63d0e4c7-4d49-4961-a294-3902d1730c44";
var multipartReader = new MultipartReader(multipartBoundary, httpResponseContentStream);
// Unexpected end-of-stream error used to occur here:
var multipartSection = await multipartReader.ReadNextSectionAsync(cancellationToken);

Once the multipartBoundary was updated to reflect an actual boundary value present in the content being parsed, the code worked as expected.

answered May 28, 2020 at 5:50

Rae

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Comments

Peter Csala · Accepted Answer · 2020-10-12 13:31:56Z

5

This worked for me for netcore 3.1

You need to add

factories.RemoveType<FormFileValueProviderFactory>();

on this method

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DisableFormValueModelBindingAttribute : Attribute, IResourceFilter
{
    public void OnResourceExecuting(ResourceExecutingContext context)
    {
        var factories = context.ValueProviderFactories;
        factories.RemoveType<FormValueProviderFactory>();
        factories.RemoveType<FormFileValueProviderFactory>();
        factories.RemoveType<JQueryFormValueProviderFactory>();
    }

    public void OnResourceExecuted(ResourceExecutedContext context)
    {
    }
}

edited Oct 12, 2020 at 13:31

Peter Csala

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answered Oct 12, 2020 at 13:17

diant

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1 Comment

Prolog Over a year ago

How this answer is different from @learner answer?

Random Lyrics · Accepted Answer · 2018-12-18 16:56:49Z

2

I used [DisableFormValueModelBinding] but still got error, then i also use:

if (Request.ContentLength == 0)
                return BadRequest();

answered Dec 18, 2018 at 16:56

Random Lyrics

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Comments

Devi99 · Accepted Answer · 2021-06-01 20:08:16Z

1

Just in case someone else is chasing ghosts regarding this error: using net5 web api I had a controller with

    [HttpPost]
    [Route("api/fileupload/{reportId}")]
    [ResponseCache(Location = ResponseCacheLocation.None, NoStore = true)]
    public async Task<IActionResult> FileUpload(int reportId)

That wasn't a good idea. It gave the abovementionned error and I remembered having to pass on additional data via file attributes. That solved it for me. Just for completeness. This worked off course

    [HttpPost]
    [Route("api/fileupload")]
    [ResponseCache(Location = ResponseCacheLocation.None, NoStore = true)]
    public async Task<IActionResult> FileUpload()

answered Jun 1, 2021 at 20:08

Devi99

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Comments

Jordy · Accepted Answer · 2022-05-12 11:35:25Z

1

If you are using MultipartFormDataContent to send the file, at the other side you will receive a mediaTypeHeader.Boundary.Value with an escaped " at the start & end (eg "\"BoundaryValue\"").

So by removing it, it started working for me. The fix for me was to add this at receiver side: .Replace("\"", "")

mediaTypeHeader.Boundary.Value.Replace("\"", "")

edited May 12, 2022 at 11:35

answered May 12, 2022 at 11:16

Jordy

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Comments

johnstaveley · Accepted Answer · 2022-05-23 13:02:44Z

1

In my case I had added another filter which was intercepting the file. Even with the filters mentioned above I still got the issue. Removing the honey pot removed the error finally.

            .AddMvc(options =>
            {
                options.Filters.Add(new AuthorizeFilter());
                // .... etc
                options.AddHoneyPot(); // This was causing the problem
            })

answered May 23, 2022 at 13:02

johnstaveley

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Comments

Glebka · Accepted Answer · 2022-11-18 09:00:55Z

1

I have this error when send invalid form-data from client. This is valid format: NOTE: two minuses and new line in the end

<empty>
------------------------------8dac95867d24bd1
Content-Disposition: form-data; name="user_login"

<data or empty>
------------------------------8dac95867d24bd1
Content-Disposition: form-data; name="user_password"

<data or empty>
------------------------------8dac95867d24bd1
Content-Disposition: form-data; name="user_session"

<data or empty>
------------------------------8dac95867d24bd1--
<empty>

answered Nov 18, 2022 at 9:00

Glebka

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Comments

irhetoric · Accepted Answer · 2023-04-09 17:24:06Z

1

In my case, I had to remove the [ValidateAntiForgeryToken] attribute.

answered Apr 9, 2023 at 17:24

irhetoric

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Comments

Iren Saltalı · Accepted Answer · 2019-07-30 09:16:04Z

0

There is bug about that in Microsoft.AspNetCore.App 2.1.4. I updated this package to 2.1.12 version and it resolved.

answered Jul 30, 2019 at 9:16

Iren Saltalı

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1 Comment

Pylyp Lebediev Over a year ago

Could you please provide reference to this issue?

aleha_84 · Accepted Answer · 2019-10-09 14:06:07Z

0

In my case it was "postman" issue. I sent the file to the REST endpoint. And at some point I started to get this error, but the code was not changed.

I re-selected this file again in "postman" and everything worked as before.

answered Oct 9, 2019 at 14:06

aleha_84

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Comments

Cheikh faye Ndiaye · Accepted Answer · 2023-12-26 12:02:56Z

0

In my case I forgot IResourceFilter in DisableFormValueModelBindingAttribute. work fine in .Net7

answered Dec 26, 2023 at 12:02

Cheikh faye Ndiaye

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Comments

Salman Arshad · Accepted Answer · 2024-01-16 11:26:35Z

0

In my case the issue was the payload... the Content-Length of the request was different from the actual length of the payload. The JavaScript code that was creating the HTTP POST was fixed to get rid of this issue.

Background: The original code looked similar to the Next.js code in this question except that it also included a Content-Length header that was different from the length of the body. And it was because the body was corrupted by body parser function. The solution is in that question.

answered Jan 16, 2024 at 11:26

Salman Arshad

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Comments

Brian Yule · Accepted Answer · 2025-01-14 11:26:22Z

In addition to disabling form value model binding, I had to update the anti-forgery middleware to stop generating the token when using file upload, by leveraging the Http request "Endpoint Feature".

public async Task InvokeAsync(HttpContext context)

{

    var endpoint = context.Features?.Get<Microsoft.AspNetCore.Http.Features.IEndpointFeature>();

    if (context.User?.Identity != null &&

        context.User.Identity.IsAuthenticated &&

        endpoint?.Endpoint?.Metadata.GetMetadata<DisableFormValueModelBindingAttribute>() == null)

    {

        var tokenSet = antiforgery.GetAndStoreTokens(context);

        var requestToken = tokenSet.RequestToken;



        if (requestToken != null)

        {

            context.Response.Cookies.Append(

                "XSRF-TOKEN",

                requestToken,

                new () { HttpOnly = false, Path = "/", Secure = true, SameSite = SameSiteMode.Strict, });

        }

    }



    await next(context);

}

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