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Graph/large-file-upload-stream-misuse

Pattern

Large File Upload Semantics

large-file-upload-stream-misuse

Client-to-S3 large uploads break when code treats file bodies as buffers in memory or misreads stream/object fields, so pointers, Body streams, or encodings fail and the API or SDK returns metadata-only payloads.

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Updated5/30/2026

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30 linked nodes

I don't want to send back the newly created resource, as it is so large, and the client doesn't need the resource at the point of the `POST` request. — sending large data (~2 GB) to the server via a `POST` request.

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.

aws s3 sync and aws s3 cp fail with MissingContentLength / stream is not seekable errors

while running an AWS Lambda function. Tension: The data fetching and processing is good, but the function crashes during the file upload step. Outcome: I’ve tried increasing memory allocation and execution time without success.

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.

nothing is getting written to the s3 bucket — trying to use ytdl-core in an AWS lambda function to upload an .mp4 of a youtube video to an S3 bucket. Tension: I cannot get ytdl to create a stream with any data in it. Outcome: Right now nothing is getting pushed to the buffer or the s3 bucket.

TypeError: data.pipe is not a function — await client.send(new s3.GetObjectCommand(bucketParams)). Tension: I can see that it's saving it to disc, but it's an empty file and also not formatted correctly. Outcome: data.pipe(fs.createWriteStream('example.pdf')).

it is uploaded to the `S3 bucket`, but when checking the file's content, it is empty(blank file). — We have a S3 bucket where we upload some files. Tension: Everything is working fine, but getting blank documents in the S3 bucket. Outcome: it worked.

we want to directly call the lambda if the size of request body is small and return response directly from lambda — We have created an AWS API Gateway which is integrated to S3 object put. Tension: keep the above integration if request body is large. Outcome: The integration pattern you were asking for is going to be constrained by the maximum size of API gateway (10MB) and Lambda payloads (6MB).

The specified copy source is larger than the maximum allowable size for a copy source: 5368709120 — I have a PHP file which copies backup files from one folder to another in Amazon S3 at the end of every day. Tension: I believe Amazon S3 requires Multi-part copying for files over that size. Outcome: I think that I now need the script to look at the size of each file and use Multi-part uploading if it finds a file over 5GB.

facing throttling issues (503 errors) — writing to S3, and facing throttling issues (503 errors). Tension: our ingestion service still encounters 503 errors. Outcome: the files are showing right under my bucket at the root level.

HTTPClientError: An HTTP Client raised an unhandled exception: sequence item 0: expected str instance, bytes found — save it into a S3 bucket. Tension: My issue is I have added a python `requests` layer which somehow messed with how Lambda send the object to s3 using https. Outcome: The error is gone if I remove the layer.

The AWS Lambda function is not being triggered when new files are uploaded to an S3 bucket. The configured S3 notification is set to respond to HTTP POST events, but no events occur and the code never runs.

Directly putting objects from user input (`MemoryStream`) to an S3 object storage using Min.IO. Tension: Exception has occurred: CLR/Minio.Exceptions.UnexpectedShortReadException. Outcome: To solve the issue, we have to reset the pointer on our own before passing it to MinIO Client SDK.

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.

Unable to parse request (not well-formed (invalid token): line 1, column 0), invalid XML received — using node.js to upload image to my s3 bucket on my local environment using localstack. Tension: This issue stems from using `Virtual-Hosted` style requests against LocalStack when using `localhost` as the endpoint. Outcome: the simplest would be to use `s3ForcePathStyle` for your client.

Unit tests cannot deterministically simulate S3 upload failure

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

aws s3 ls s3://bucketname > out.txt does not efficiently export 10m S3 objects as file URLs

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.

Uploading a 12MB CSV to a Next.js API route fails with a 413 Payload Too Large error, meaning the request exceeds the server’s allowed body size. Attempts to increase the limit via `export const config` cause a build error due to deprecated config usage.

Redux Toolkit reports that a non-serializable value was detected in an action payload when dispatching/store updates involving a downloaded File/Blob.

API response payload appears to be encoded as unreadable data

String value length (20048537) exceeds the maximum allowed (20000000, from StreamReadConstraints.getMaxStringLength()) — Spring Boot application where I'm trying to upload files or large content through a REST endpoint. Tension: the request is being rejected by Spring Boot. Outcome: Once I stopped sending the file in JSON, the problem disappeared.

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.

Spring MVC endpoint returns an empty body with 0 content type when downloading a large file via WebClient streaming

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).

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