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Graph/presigned-upload-friction

Pattern

Pre-Signed Upload Friction

presigned-upload-friction

Client-side uploads that rely on pre-signed URLs and multipart/form-data often fail due to header/metadata mismatches, filename/object-key construction, and build-time or size constraints, leading to wrong object names, truncated uploads, or inability to validate parts.

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Public graph metadata

Updated6/25/2026

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30 linked nodes

in `onUploadProgress` and `onSuccess` callback. Tension: the `files` variable is not updated properly.

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

it doesn't trigger the unprocessable entity or bad request error — When I'm calling the POST endpoint with partial data or with keys I don't specify in my class. Tension: Even if the auto-created documentation tells me that there are some required fields.

Fastify + Zod validation prevented access to the original/unmodified request body needed to verify a webhook signature, causing the signature verification to fail with the initial handler code.

trying to get an object from my S3 bucket using pre-signed URLs. Tension: I've tried encoding the slashes `%2f` with no change. Outcome: upgrade to the latest SDK, in your case boto3.

using pre-signed-url, I can't check the file size of each part — multipart upload in my application. Tension: all the options I thought do not appear to be good one. Outcome: I really would not like to get the file in any endpoint of my application.

S3 blocking requests (403 Forbidden, no response body) if the filename is constructed from Unicode codepoints — Upload via presigned request - 403 forbidden for Unicode Filename. Tension: filename is constructed from Unicode codepoints. Outcome: Using `x-amz-meta-filename` suggests that the user-provided meta-data is transferred via HTTP request headers.

All of the put/upload functions want a set content length. Tension: Building the zip locally is not an option, because the end size of the zip can be tens of GB. Outcome: I essentially need a zip "placeholder" on S3 that I can stream to.

The HTTP request cannot be executed: The peer resets the connection. — When I try to upload files to S3 from storage via an application deployed on the stand. Tension: Everything is working locally. All files is uploading without errors. Outcome: com.amazonaws.SdkClientException exception.

I'm getting CORS error — I'm trying to generate s3 presigned url to upload `video/mp4` files to a bucket from react app client in development mode in my localhost. Tension: the whole thing starts working after a few hours without any changes to the setup. Outcome: the presigned url stops giving cors error.

SignatureDoesNotMatch — curl --request PUT --upload-file "/path-to-this-file/test.html" "presigned-url". Tension: The request signature we calculated does not match the signature you provided. Outcome: where did I do incorrectly and how to resolve it?

pre-sign the URL to upload a file in Flask. Outcome: The problem is that you created a pre-signed URL that includes a Content-Type header but you didn't indicate that header later when you used the URL.

Uploading to S3 via a presigned PUT URL does not apply the desired object tags even when the server-side PutObjectCommand includes the Tagging parameter.

Bucket POST must contain a field named 'key' — When I set these headers in Postman. Tension: When I specify a 'key' I get a new error:. Outcome: I needed to do the following instead:.

docs are very sparse — AWS SDK for Swift is still in developer preview. Tension: I want to create a pre-signed URL for an object.

SSL validation failed for https://bucketname.s3.amazonaws.com/ [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate — when loading a file to S3 bucket. Tension: python not able to find certain certificates. Outcome: apply the following parameter when creating the s3 object.

Unit tests cannot deterministically simulate S3 upload failure

Minio upload with a stream blocks until the file stream is closed

while uploading the file from Browser. Tension: Aws error message was misleading, instead of asking us to send the security fields in the correct order it is telling us AccessKEY is not found. Outcome: Just changing the order of the form data in the frontend code worked for me.

when I try uploading from mobile browsers, the upload just loads forever — I'm building a document uploader using Supabase Storage. Outcome: I've tried using different networks, browsers and devices, but it's still the same problem.

The form doesn't actually POST anywhere; it simply calls a function when the form is submitted. — I have built a form with fields for an email and password. Tension: Should I be concerned about bot attacks? Should I protect the submission in some way (reCAPTCHA, honeypot, etc.)? Outcome: yes - you should be worried.

There is no way to distinguish %PDF-i`*`fect from %PDF-i`*`fect — during file uploads to prevent Cross-Site Scripting(XSS). Tension: Generally no way to know for certain if a client has a virus/trojan or viral/trojan files for uploading. Outcome: You can only tell once the file has been uploaded where you can run diagnostics in your lab.

In JWT signing, why does the issuer compute a hash (e.g., SHA-256) of the base64url-encoded header and payload before generating the signature, instead of signing the base64-encoded contents directly?

isn't HTTP Signature enough by itself to prove identity? — secure an API and looking into ways to secure it. Outcome: why use it in combination with something else (like API key or OAuth)?

File uploads in a Laravel 12 + Inertia (React) form do not work when sending the update request using a PATCH method.

Validation errors set inside the onSave/submit handler are not reflected in formMethods.formState.errors when checked immediately, leading to incorrect conditional logic. The developer expects updated errors to be available in the same callback scope.

415 Unsupported Media Type — upload a property object (JSON) along with multiple images using `multipart/form-data`. Tension: Content-Type 'application/octet-stream' is not supported. Outcome: Here is a Postman example that worked for me with Spring.

File uploads submitted from Safari to a Tomcat server become corrupted when HTTP/2 is enabled; uploads succeed in Chrome and when HTTP/2 is disabled. The issue affects multiple medium-sized files (a few MB).

the signed file cannot be verified now — I am using iText to digitally sign PDF files, and we are using a non-internationally popular algorithm called SM3WITHSM2. Tension: I am not sure where the problem lies.

Invalid signature: Document is modified. — When trying to insert the certificate from the ESP response. Tension: signature become invalid when checked in adobe. Outcome: the hash of the signed document bytes is incorrect here.

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