Home Search Pricing Get inErrata About

Sign in Sign up

Graph/multipart-upload-header-semantics-mismatch

AntiPattern

Multipart Upload Header Semantics

multipart-upload-header-semantics-mismatch

S3 and HTTP upload flows fail when metadata, Content-Type, and form fields are treated as interchangeable—wrong header names/orders, unsupported MIME types, or mixing body/params parsing prevents correct signing and upload completion.

Node Details

Public graph metadata

Updated6/23/2026

Connections

30 linked nodes

MATCHESSolution

the issue was that I was passing in the Data URI as well with the encoding of the file. Outcome: make sure that the string of the file that you're sending doesn't contain this value: `data:@file/png;base64,`.

MATCHESSolution

Create a POST request to generate a signedUrl on the server — Send that URL to the client and POST the upload form with image to the S3 bucket. Tension: bypassing the server. Outcome: With that url you can POST directly to S3.

MATCHESSolution

Store uploads in the serverless writable temp directory (os.tmpdir()) during the request and then persist the files externally (e.g., upload to object storage like S3) or stream them directly; update the Multer storage destination to use os.tmpdir() and avoid serving from a project-local uploads folder.

MATCHESSolution

In Postman, select form-data and type as File and upload the audio file. — POST /transcribe?song_name=wait&singer=hadar HTTP/1.1. Tension: Check the request body to make sure that it is in the correct format and none of the required fields are missed. Outcome: upload the audio file.

MATCHESSolution

Use a clean percent-encoded presigned URL and allow access via pre-signed URLs in the S3 bucket policy

MATCHESSolution

Set requestChecksumCalculation(RequestChecksumCalculation.WHEN_REQUIRED) in the S3 client builder

MATCHESSolution

Those values require encoding per RFC 2047 — Using `x-amz-meta-filename` suggests that the user-provided meta-data is transferred via HTTP request headers. Tension: This does not work with AWS. Outcome: One Idea was to use the Base64 encoding and do the wrapping/quoting/envelope with string concatenation.

MATCHESSolution

An error occurred (MissingContentLength) when calling the PutObject operation: You must provide the Content-Length HTTP header. — aws s3 sync . s3://. Tension: Unknown options: --content-length,1093865263. Outcome: Try downgrade aws cli version.

MATCHESSolution

Adding http-auth-2.30.4.jar to the classpath — Exception while uploading a file to AWS S3. Outcome: resolves this issue and the Exception no longer occurs.

MATCHESSolution

I wrote (borrowed) the following code. Tension: I couldn't get it to work with AWS s3. Outcome: successfully returns an AWS S3 object using header authentication.

MATCHESSolution

adding a class that extends `OutputStream` and creates a multi-part upload when the buffer reaches the set limit — AWS minimum is 5MB. Tension: end size of the zip can be tens of GB. Outcome: I set it to 10MB.

MATCHESSolution

Adding `x-amz-meta-author` to the headers for the PUT request allowed the data to be available in the `HeadObjectCommand` — fetch(signedURL, { method: 'PUT', headers: {. Tension: `x-amz-meta-author` is nowhere to be found. Outcome: Metadata: { author: 'John Doe' }.

MATCHESSolution

I needed to use the MultipartCopy class found in the S3 SDK. Tension: Over 4.5 GB - Use MultipartCopy. Outcome: This is now working...

MATCHESSolution

when calling fetch — you created a pre-signed URL that includes a Content-Type header. Tension: you didn't indicate that header later when you used the URL.

MATCHESSolution

Change the S3 event configuration to use a broader object creation event such as “All Object Create Events” (e.g., s3:ObjectCreated:*) so the Lambda triggers for typical PutObject-based uploads.

MATCHESSolution

var md5Based64 = Convert.ToBase64Str — Upload using RestSharp: (failed - Bad Digest). Tension: BadDigest - The Content-MD5 you specified did not match what we received. Outcome: both have the same inputs.

MATCHESSolution

I needed to do the following instead: — s3.createPresignedPost(params, (err, data) => {. Tension: which DID return the key back in the fields. Outcome: allowing me to add the key field in Postman and successfully post my file.

MATCHESSolution

Use the `.presignURL` extension on the `GetObjectInput` and `PutObjectInput` structs — for downloading & uploading S3 objects. Tension: generate pre-signed URLs for downloading & uploading S3 objects. Outcome: Here is a fully working example I wrote:.

MATCHESSolution

upload an empty folder and specify the following settings in the upload configuration. — If your bucket policy prevents uploading objects to this bucket without tags, metadata, or access control list (ACL) grantees. Tension: you can't create a folder by using the following procedure. Outcome: Instead, upload an empty folder and specify the following settings in the upload configuration.

MATCHESSolution

You may want to consider configuring your S3 bucket's CORS configuration — to allow specific websites served from other domains to pull your image and display it. Tension: You are serving a mix of HTTP and HTTPS content which often results to this problem. Outcome: hosting the image on a local server that runs on top of HTTP to make sure that all content is hosted on HTTP.

MATCHESSolution

For multipart + pre-signed uploads from expo react-native with express backend is as follows: — upload a large video file the fastest on RN Expo.

MATCHESSolution

const fileStream = createReadStream(path); — async function uploadImageToS3( fileStream: NodeJS.ReadableStream, fileName: string. Outcome: Body: fileStream,.

MATCHESSolution

Just changing the order of the form data in the frontend code worked for me. — uploading the file from Browser. Tension: Aws error message was misleading. Outcome: I just interchanged the position of `x-amz-signature` and `x-amz-security-token`.

MATCHESSolution

Use a collection with upload: true, submit a FormData POST to /api/media with file, then update the document with the returned file id

MATCHESSolution

Submit the form as POST while overriding the method using the `_method: 'patch'` field, and ensure `forceFormData: true` is set so the file is sent as multipart data.

MATCHESSolution

select the multipart data radio button — Postman typically handles the specifics of the multipart request. Tension: Did you manually specify a Content-Type header of multipart/form-data? Outcome: Postman would be more complex like this, for example:.

MATCHESSolution

And multipart file locationCreateFile = fileUpload. Tension: the API consistently picks up the old file instead of the modified version. Outcome: Then status 200.

MATCHESSolution

Form data should be read using `@RequestParam`, not with `@RequestBody` — if you really need JSON. Tension: you’ll have to split it into two separate calls. Outcome: one for the file (form-data) and another for the JSON payload.

MATCHESSolution

Failed to encode MIC. Tension: I want to sign the MDN based on the AS2 request. Outcome: Data must be specified.

MATCHESSolution

Create separate FileFields/Storage instances with the correct backend option by using `bucket_name` (e.g., `S3BotoStorage(bucket_name='other-bucket')`) so uploads go to the intended public bucket.

[inerrata]Tags Knowledge Graph Docs About Team Pricing Contact Report a Bug Privacy Terms Cookie Settings Do Not Sell or Share My Info

© 2026 Inerrata

Multipart Upload Header Semantics - inErrata Knowledge Graph | Inerrata