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Graph/s3-event-type-mismatch

Pattern

S3 Event Type Mismatch

s3-event-type-mismatch

A recurring integration shape where S3 notifications are configured for a narrow HTTP method/event type (e.g., POST) while real uploads use a different API (e.g., PUT), so Lambda never triggers despite correct code and IAM.

Node Details

Public graph metadata

Updated4/30/2026

Connections

30 linked nodes

AWS Lambda functions using the same Sentry DSN/client key began receiving Sentry rate-limiting errors (HTTP 429).

The error occurs during the build/deployment process in AWS Amplify — a Next.js (v13+) API route that handles Stripe webhooks. Tension: I can't pinpoint the exact cause. Outcome: Solved by using this version of SDK.

When processing a metered billing event in an AWS Lambda (NodeJS), Stripe returns: "Livemode of key does not match mode of account" even though the user is using a test mode key.

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.

the file is remaining in the bucket sometimes with delete markers — when the function runs via the S3 trigger. Tension: If I run the function using the Test button afterwards, it deletes every time. Outcome: I was able to resolve this by using Cloudwatch EventBridge to monitor S3 CreateObject event.

I am using AWS SDK to generate a presigned S3 object URL and sending it as a mail notification. Tension: Even though I am setting the expiration time to 2 days.

Status code: 403, reason phrase: Forbidden — Trying to visit path from S3 path directly gives me the error down below. Tension: I gave my lambda function's role all policies to ReadOnly S3 and DynamoDb. In S3 object ownership is set to ACLs Disabled. All 5 block public access checkboxes are unchecked. Outcome: it is possible that the object being requested does not exist but is still giving an Access Denied error.

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

This isn't possible with s3 sync — I have an S3 bucket which does not have versioning or lifecycle rules set due to a client decision. Tension: we also want to keep a backup of the files that has been worked on in the last 30 days. Outcome: it would be a perfect use case for S3 bucket Event notifications.

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.

I need to access certain S3 buckets programmatically using IAM Roles Anywhere — working on a Spring Boot backend service. Tension: I’m unsure how to use it to create IAM Roles Anywhere sessions and authenticate to access S3.

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.

I keep encountering a SignatureDoesNotMatch error. — trying to interact with Supabase's storage using the S3 protocol in Golang. Tension: I have followed Supabase's example provided in JavaScript and translated it into Go. Outcome: For anyone else who spends way too much time on this like I did; I had success just using the v4 request signer.

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).

Error: creating CloudTrail Trail: InsufficientS3BucketPolicyException: Incorrect S3 bucket policy is detected for bucket — Everytime I am trying to deploy my terraform code in Spacelift. Tension: Incorrect S3 bucket policy is detected for bucket. Outcome: Could you please help me with this?

understanding the event payload structure passed by EventBridge to my .NET Lambda function — an AWS serverless application using .NET, where I'm configuring a Lambda function to be triggered by S3 events routed through AWS EventBridge. Tension: I'm specifically seeking guidance on understanding the event payload structure passed by EventBridge to my .NET Lambda function and how to process it effectively. Outcome: How can I deserialize and process the event payload within my .NET Lambda function to perform actions based on the S3 event that triggered it?

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.

when I test the Lambda function using the S3-put option. Outcome: This is not the expected result.

But how can I get the event data when a file is uploading to the S3 bucket? — testing aws lambda python locally with docker. Tension: I want to test it locally and I need the event data. Outcome: Here how can I get the bucket and key when I'm running the Lembda locally.

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.

You are missing one colon in the S3 resource ARN — BucketPolicy: Type: AWS::S3::BucketPolicy. Tension: Resource: !Join [ '', ['arn:aws:s3::', !Ref S3Bucket, '/*']]. Outcome: Resource: !Join [ '', ['arn:aws:s3:::', !Ref S3Bucket, '/*']].

continuously getting the error: TypeError: Failed To Fetch — I'm using the AWS SDK V3 in my Nextjs application to upload files to s3. Tension: I've previously had this working with no issue but when I changed my secret key on my user today. Outcome: Downgrading to @aws-sdk/client-s3@3.317.0 fixed the issue for me.

Unit tests cannot deterministically simulate S3 upload failure

AmazonS3Exception: The AWS Access Key Id you provided does not exist in our records

Class not found: com.demo.lambda.handlers.DemoHandler: java.lang.ClassNotFoundException — using AWS S3. Outcome: Current classpath: file:/var/task/.

updating the connection of an s3 bucket, from TLS 1.0 to TLS1.2 — the following connection has been detected: `eu-west-3|bucket| REST.GET.OBJECT|TLSv1|62|[BPImageWalker/2.0 (www.bdbrandprotect.com)]`. Tension: I have been unable to detect where it comes from. Outcome: cloudtrail to detect TLS 1.0 connections and the results are 0.

When calling s3.putObject, AWS SDK throws an error stating that the bucket must be addressed using the specified endpoint.

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