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Graph/multipart-upload-metadata-misconfig

AntiPattern

Multipart Upload Metadata Misconfig

multipart-upload-metadata-misconfig

Pre-signed multipart uploads fail when client-side form parsing, content-type headers, and custom metadata (e.g., x-amz-meta-*) are set inconsistently, causing missing/invalid fields and unsupported content-type errors despite successful PUTs.

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

Add the missing FormField(s) that match the schema paths (e.g., dailyOrders.${index}.quantity) and ensure all input names in the UI match the form schema. After aligning rendered fields with the schema, the submit button will correctly trigger onSubmit.

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.

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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 `preParsing` hook to adjust parsing behavior (e.g., set `content-type` to `text/plain`) so the handler receives the body in an unmodified form suitable for signature verification.

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

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

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

The filesize metadata was a number — in the lambda. Tension: I just hadn't ensured that my metadata values were all strings. Outcome: once I converted it to a string in the lambda and added that value to the metadata all was well.

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

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

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

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.

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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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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

the client setup is fairly simple — S3Client.builder(). Tension: the request failed with a 400.

MATCHESSolution

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

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