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Graph/multipart-upload-contract-mismatch

AntiPattern

Multipart Upload Integration Gaps

multipart-upload-contract-mismatch

Binary and form-data uploads break because handlers, content-type expectations, and client callbacks disagree (e.g., multipart/form-data vs octet-stream, formData Blob vs expected file types, temp file limits), causing missing files or failed transfers.

Node Details

Public graph metadata

Updated7/6/2026

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

You can use the `prefix` field to set a sub-directory. — vercelBlobStorage({ enabled: true, collections: { media: { prefix: 'cms_images', }, }, token: process.env.BLOB_READ_WRITE_TOKEN, }). Tension: As of now, there's no fix for this. Outcome: You can manually handle uploads as shown here.

MATCHESSolution

how about downloading the data from the URL and uploading it to Gemini without creating a file? — When this is reflected in the script. Tension: the URL cannot be directly used.

MATCHESSolution

Use upload(`content/temp/${file.name}`, file, { handleUploadUrl, clientPayload }) and return the pathname settings from onBeforeGenerateToken()

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

files should be attached to the binary option when defining the Body of your request in Postman. — Postman. Tension: it had nothing to do with Vercel, as I expected. Outcome: All in all, files should be attached to the binary option when defining the Body of your request in Postman.

MATCHESSolution

you should select `Body` -> `form-data` — when using FastAPI/Starlette's `UploadFile`. Tension: the key should then be `files`, for instance. Outcome: upload your file in the `Value` section by clicking on the `Select files` button.

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

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

MATCHESSolution

JavaScript can access the `size` from the File object — using a UI for the upload. Tension: I really would not like to get the file in any endpoint of my application. Outcome: Use this value to populate the `content-length` header value.

MATCHESSolution

As of 5/8/2025, the only known workaround is to download the file and upload it using LocalBlob. Tension: the only known workaround. Outcome: download the file and upload it using LocalBlob.

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

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

After adding a `plugin` called serverless-apigw-binary — in my serverless.yml file. Tension: I was missing a part for `Binary media types`. Outcome: adding apigwBinary types as `application/pdf` and `multipart/form-data` in my serverless.yml file, it worked.

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

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

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

MATCHESSolution

Use the supported approach for Next.js app-route handling—e.g., switch to `formidable` (as suggested) to handle multipart uploads and read the file without relying on the deprecated `bodyParser.sizeLimit` config. Alternatively, move the endpoint to the `pages` directory if you need to use `export const config` bodyParser settings there.

MATCHESSolution

Move reader.readAsDataURL(file) outside reader.onload and call it after setting the handlers

MATCHESSolution

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

What to do once the request stream size exceeded the limit? — I'm building a file upload handling library in Node.js. Tension: I want to know how to close the request so that no further data can be sent over the wire and waste the server resources. Outcome: you must use promise object which is stable to handle asyncronous tasks.

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

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

MATCHESSolution

Important is the content type application/json. — I didn't use an array for the binary files, but I think if you just define another one with the same key, that should work. Tension: I didn't use an array for the binary files. Outcome: if you just define another one with the same key, that should work.

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.

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