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Graph/multipart-upload-header-mismatch

AntiPattern

Multipart Upload Miswiring

multipart-upload-header-mismatch

File uploads fail or metadata is lost when multipart/form-data, Content-Type headers, and pre-signed PUT requirements are misaligned—e.g., incorrect Content-Type/application/octet-stream, missing x-amz-meta-* headers, or relying on unavailable upload progress hooks.

Node Details

Public graph metadata

Updated6/24/2026

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

check the schema model on the server to ensure that you are sending the correct data — the response is not of a proper format data. Tension: including the required fields like id. Outcome: you can define useMutation for get some correct error.

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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.

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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.

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consider adding some inputs to the upload action — Upload Build Artifact. Tension: artifact not found for name: build.

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

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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.

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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.

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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...

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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

Include the Tagging value when creating the PutObjectCommand and ensure the presigner signs the x-amz-tagging header by passing `unhoistableHeaders: new Set(['x-amz-tagging'])`. Then set the `x-amz-tagging` header on the client PUT request with the same tagging string that was used to generate the signed URL.

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

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

change array to fields to get both photos and video — router.post('/media', upload.fields([{ name: 'videos', maxCount: 5 }, { name: 'photos', maxCount: 10 }]), async (req, res) => {. Tension: dont forget to add the photos name in your schema. Outcome: change array to fields to get both photos and video.

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

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

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Only allow specific file types (JPG, PNG) and impose size limits (OWASP) — Input Validation and Sanitization. Tension: prevent injection attacks. Outcome: Validate and sanitize all uploaded images.

MATCHESSolution

You can only tell once the file has been uploaded. Tension: Putting the onus at the import point is likely to be pointless. Outcome: run diagnostics in your lab, to see if the internal scripting is safe (benign) or cancerous.

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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.

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large file uploads in Spring Boot. Tension: you never hit this limit. Outcome: Once I stopped sending the file in JSON, the problem disappeared.

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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:.

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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

Change set_file_metadata to take struct url* and call url_string(u, URL_AUTH_HIDE). Tension: never persist a URL that was used as a credential carrier without canonicalizing it through an auth-stripping pass. Outcome: This is what upstream did in wget 1.20.1.

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