Aws api gateway error codes When I call my REST API, I receive a configuration error and an HTTP 502 status code. All the clients from web applications or mobile apps connect through the gateway. The following provides troubleshooting advice for errors and issues that you might encounter when using AWS Lambda integrations with HTTP APIs. Previously, you had to code client-side logic in order to process default responses generated by API Gateway, such as for request validation failure or limit exceeded errors. I get an "400 Bad Request" error when I call my API with private integration in Amazon API Gateway. 6 days ago · How to Fix AWS API Gateway 'Missing Authentication Token' Error: When Lambda Works in Test but Fails via Invoke URL (SageMaker Integration) Integrating AWS Lambda with Amazon SageMaker is a powerful way to build scalable, machine learning-driven applications. How and where can I begin troubleshooting here? Jun 20, 2024 · While AWS’s cost-saving measures can lead to inconvenient 500 errors after periods of inactivity, understanding why this happens and how to mitigate the impact can improve your API’s Newbie here: we are still in testing phase and hardly have any traffic on our api gateway but are getting 503 errors. Problem: When I use Postman (or anything else) to test POST method on API Gateway, the API Gateway keep returning "message": "Not Found". If you have a long runtime, such as running a scraper and having to send a response to client, then use ECS or EKS (Kubernetes) with an ALB. It is random, we will get 200 responses, But the api gateway does not react to the "statusCode" value in the response and just simply sends back the response from the lambda with 200 response code. Jan 17, 2022 · AWS API Gateway is an HTTP gateway, and as such, it uses the well-known HTTP status codes to convey its errors to you. 8 with a Lambda Proxy API Gateway trigger: It is indeed possible to return custom HTTP error codes: Jun 19, 2018 · The service may retry the request, depending on the retry policy of that specific service. The PUT method Dec 6, 2016 · I am trying to create a lambda service on AWS and have it accessed from outside via the API gateway with no authentication or restriction required. Dec 21, 2017 · Here in the blue print says, API gateway will respond with 401: Unauthorized. API developers can create APIs that access AWS or other web services, as well as data stored in the AWS Cloud. This one s Now, I read that when API gateway fails to find a matching template it rejects with a 415 error, so I changed aforementioned option to "When no template matches the request Content-Type header". I am using custom authorization function for authorization. Apr 30, 2017 · I am trying to set up a hello world example with AWS Lambda and serving it through API Gateway. Introduction to AWS API Gateway AWS API Gateway is a service that allows developers to create, publish, maintain, and secure REST and WebSocket APIs at scale. Where can I start to try to fix this. Nov 13, 2020 · Hey I have a web socket deployed to AWS API gateway with a custom domain and lambda's backing it. Here is my template. I want to find specific 5xx errors from API Gateway in my Amazon CloudWatch logs to troubleshoot. 1 day ago · We’ll use native Python tools, programmatically generate OpenAPI specs, integrate with AWS API Gateway, and host a live Swagger UI—all while keeping your documentation in sync with your code. I want to know why this happens and how I can troubleshoot the issue. Suppose the uncompressed version of the payload is more than 10mb but the compressed version is less than 10mb, then when aws api gateway auto decompress it, will it reject the request stating "Error "413 Request entity too large". AWS API Gateway’s Custom Authorizers (now called “Lambda Authorizers”) are a powerful tool for controlling access to your APIs—they let you use a Lambda function to validate tokens (e. I set up my Amazon API Gateway API to invoke an AWS Lambda function using a stage variable. If I send the same request again with the May 26, 2016 · I have a server less API with AWS API Gateway and Lambda function. Common Causes of the 500 Internal Server Error Jul 21, 2023 · In terms of AWS API Gateway, this means there’s likely a problem with your Lambda function or the API Gateway service itself. API Gateway throttles requests to your API using the token bucket algorithm, where a token counts for a request. It will show as follows, I set up my Amazon Cognito user pool as a COGNITO_USER_POOLS authorizer on my Amazon API Gateway REST API. Open the API Gateway console Jun 5, 2023 · 1 I cannot get API Gateway POST route to return properly when linked to my working AWS Lambda. js Express-based API to lambda. I wrote the same raise Exception('Unauthorized') in my lambda and was able to test it from Lambda Console. In API Gateway > Resource > Actions Dropdown > Create Method > tick Lambda Proxy Integration and select appropriate Lambda function. A critical feature for securing APIs is **Custom Authorizers**—Lambda functions that validate credentials (e. So every time you check terraform plan. I see 5xx errors in my Amazon API Gateway CloudWatch metrics. It's not perfect - you now need to maintain the server. This is an intended limit by AWS. When I call my Amazon API Gateway API, I get a 403 error. However, these metrics, specifically the 4xx and 5xx … I tried to invoke my Amazon API Gateway REST API and received 403 "Missing Authentication Token" error messages. But in POS CloudWatch Logs metric filter example that shows how to count log events into a single metric. It is possible to define mapping templates on the integration response to transform the Lambda response body into a different form for the API Gateway method response. This error indicates that the server encountered an unexpected condition that prevented it from fulfilling the request. Jul 9, 2017 · I'm very new to the API Gateway and Lambda. 6 days ago · AWS API Gateway is a powerful service for building, publishing, and securing APIs at scale. But what happens when your POST method suddenly throws a "User is not authorized to access this You can change the API Gateway-generated Status code to return a different status code that meets your API's requirements. Learn causes, fixes, and best practices. Optimize your APIs today! I am new to AWS API Gateway, I use it with AWS Lambda (Java). Errors in the range of 400 to 499 usually point to a problem with the API client, and errors in the range of 500 to 599 mean something on the server is wrong. I have an API Gateway with a LAMBDA_PROXY Integration Request Type. Jun 13, 2016 · In this example, API Gateway returns the Lambda response body verbatim, a. When I call my REST API, I receive a configuration or internal error that has an "HTTP 500" status code. I clicked the "Create a Lambda Function", which set up the API Gateway and selected the Blank Reference for variables access logging, etc. How do I troubleshoot 504 errors that I receive when I use an Application Load Balancer? Jun 22, 2018 · To troubleshoot, you can turn on verbose logging in API Gateway which will log the full request and response with headers, query parameters, and body. When I mention Authentication type NONE it works fine but API become public and anyone with url can access my API. As such, much of my AWS 3 days ago · The digital landscape of today is intricately woven with Application Programming Interfaces (APIs), serving as the fundamental conduits through which modern applications communicate and exchange data. I started by creating a lambda function with node. Dec 5, 2024 · Lambda Function Issues: If the API Gateway integrates with AWS Lambda functions, any runtime errors within these functions can propagate back to the API Gateway, resulting in a 500 error. Recently, one of our AWS API Gateway HTTP APIs has started failing with HTTP status code 413 and a message "Request Entity Too Large" when the API returns a stream of data (like a PDF file for example) of size greater than 10MB. If there is a match, API Gateway returns the Lambda error as an HTTP response of the corresponding HTTP status code. How do I troubleshoot these errors? API Gateway and Lambda are designed for short runtimes. I'm attempting to deploy a Node. In this example, the customization changes the status code from the default (403) to 404 because this error message occurs when a client calls an unsupported or invalid resource that can be thought of as not found. Change the status code to 404 if it was not already set. This is useful when you want to format or filter the response seen by the API client. Confirm the success codes that the load balancer is expecting and that your application is configured to return these codes on success. e : Sep 14, 2024 · The 500 Internal Server Error is one of the most common errors encountered when using AWS API Gateway. What is Amazon API Gateway? API Gateway enables creating, publishing, monitoring, securing REST, HTTP, WebSocket APIs for accessing AWS services, data, business logic. a. So it seems the API Gateway is misconfigured somehow and is translating the 200 OK from the Lambda into a 500 ISE back to the client-side. Jan 18, 2021 · I'm trying to test out API gateway and Lambda functions however I can't seem to get my API gateway to connect to the Lambda function. How to change the status code in AWS API gateway if the response if failure. k. To make things easy I set the gateway for now to Learn how to set up parameter mapping to modify API requests and responses for Amazon API Gateway HTTP APIs. I put an API Gateway endpoint in front of it with a VPC_LINK integration with an NLB in a private subnet. The AWS API Gateway handles authentication, logging, and WAF along with the Jul 21, 2023 · Understand the 429 Too Many Requests Error in AWS API Gateway and learn about triggers and effective debugging tools. Nov 2, 2025 · APIs are the backbone of modern applications, and securing them is non-negotiable. Aug 5, 2024 · I am using AWS REST API gateway, Non-Proxy integration, integrated with a Lambda function. succeed in the Lambda, the response header is sent back with code 302 as expected (shown below). In the past days I created a PUT method for a new API resource, with an API Key as a simple first security step. Oct 21, 2019 · } } Here I would like to change only the response template and leave the status_code as it is. Jul 13, 2016 · For HTTP and AWS integrations, the error pattern is matched against the HTTP status code of the integration response. If a high number of requests throttles the backend service, then the API Gateway API might return an Internal server error. authentication) you may need to pull a bit of code into the application on the EC2. To make API call s Jul 21, 2023 · Learn how to debug and resolve AWS API Gateway 500 Internal Server Errors and how to fix them effectively. Increase rate and burst limits if necessary The gateway response for an invalid API configuration—including when an invalid endpoint address is submitted, when base64 decoding fails on binary data when binary support is enacted, Sep 30, 2023 · I have a Cloudformation template (see bottom) which allows me to fetch S3 objects directly via the API Gateway. I configured Amazon API Gateway with virtual private cloud (VPC) link integrations. When I try to invoke my AWS Lambda function, the request fails with a 502 or 500 server-side error. If your traffic exceeds these, AWS will start dropping requests with a 429. I receive an HTTP 504 error status code when I invoke a REST API using Amazon API Gateway with an AWS Lambda backend. For more information, see . ) is to return a String that must match the Lambda error r What is AWS Lambda? AWS Lambda enables processing real-time data streams, building scalable web applications, creating secure API backends, handling web, mobile, and IoT requests, processing files automatically, responding to database changes, running automated scheduled tasks, controlling security access permissions, configuring environment variables, versions, and layers, scaling concurrency Mar 21, 2025 · Introduction AWS API Gateway is a powerful service for building, deploying, and managing APIs at scale. But you can have a very long lived connection. The gateway response for authorization failure—for example, when access is denied by a custom or Amazon Cognito authorizer. e. API Gateway posts a message, which is received on the request's body, on the queue. For this, you configure the method's integration request and integration response to associate a response with a given status code. Have you considered just a small EC2? Depending on what the API gateway does (i. But how does the API Gateway know whether the Lambda returned a genuine response or an error? Learn about mapping template overrides for your API's request and response parameters and status codes. js. The target did not return a successful response code By default, the success code is 200, but you can optionally specify additional success codes when you configure health checks. , JWT tokens, API keys) and return IAM-style policies to allow or deny access to API resources. Sep 30, 2024 · Troubleshooting a 500 Internal Server Error in AWS API Gateway API calls can be a complex task, but by following the steps outlined above, developers can systematically identify and resolve the underlying issues. “passthrough”. How do I troubleshoot 503 (service unavailable) errors from my Application Load Balancer? May 13, 2025 · Now, here are 5 ways to troubleshoot it: Check the API Gateway rate limits Go to API Gateway → Stages → Method Settings Look at the “Rate” and “Burst” limits for your endpoint. See full list on ncoughlin. Apparently the only way to change the response status code (to 4xx, 5xx, etc. I want API gateway to return proper error codes like 400, 404, 500 etc. It acts as a managed service that handles API requests, processes them, and returns responses. It works fine when getting objects that exist, returning a 200 and the object contents: When I send requests to my REST API with Amazon API Gateway, I receive an "Exceeded throttle limits" or "Exceeded quota limits" error. Read now! Request a POST REST API endpoint by using a tool such as Postman, another API, or other technologies. Mar 9, 2016 · Why does it have to be so hard?API Gateway and Lambda are great until you need to return an error object from your REST API. My response will be as following " Jan 24, 2024 · Using API Gateway and AWS Cloudwatch to monitor your HTTPs errors at a granular level AWS provides default API Gateway Metrics for alarm usage. Jun 6, 2017 · You can modify each part of the response generated by API Gateway, such as HTTP status code, header, or response body. In order for your api to show a proper response the return type of lambda function should be a specific format i. Feb 28, 2020 · That means that API Gateway will only try to match that regex with an error returned by the Lambda. You also saw how to transform requests coming to your new API from existing or legacy clients, without asking your customer to do any code changes. When setting status codes for an API method, you should choose one as the default to handle any integration response of an unanticipated status code. Lambda Exceptions When an exception is thrown from your handler/function/method, the exception is serialised into a JSON message. Looking at the API-Gateway-Execution-Logs_{api gateway id} log group I saw the following message Execution failed due to configuration error: No match for output mapping and no default output mapping configured. Specifically, API Gateway examines the rate and a burst of request submissions against all APIs in your account, per Region. When I send a GET re Sep 20, 2024 · AWS API Gateway is a fully managed service that allows developers to create, publish, maintain, and secure APIs at any scale. In OpenAPI, a GatewayResponse instance is Dec 19, 2024 · With this knowledge, you are better equipped to troubleshoot, resolve, and prevent 500 Internal Server Errors in your AWS API Gateway implementation. I have modified the log output within the API Gateway instance, but not much else. I set an A gateway response is identified by a response type that is defined by API Gateway. Dec 18, 2020 · I want to return 401 when "isAuthenticated" = False or find a way to send 401 error code from the API-Gateway/authorizer, in the REST API-Gateway this is possible by raising an error/exception with "Unauthorized". Nov 4, 2016 · API Gateway + AWS Lambda Exception Handling There's a number of things you need know about Lambda, API Gateway and how they work together. 2 days ago · Apigateway › developerguide What is Amazon API Gateway? API Gateway enables creating, publishing, monitoring, securing REST, HTTP, WebSocket APIs for accessing AWS services, data, business logic. HTTP 503 status code (Service Unavailable) HTTP 503 status code troubleshooting, Amazon S3 request rate optimization, Elastic Load Balancing health checks, custom origin resource monitoring, API Gateway backend integration issues, CloudFront load testing guidelines, Lambda@Edge function execution errors, Lambda@Edge quotas exceeded. API gateway module tf file provider "aws" { version = " Mar 14, 2016 · I'm trying to create a backend system with AWS API Gateway and Lambda. Problem is that the API Gateway works, but sometimes it returns 500 Internal server error. The response consists of an HTTP status code, a set of additional headers that are specified by parameter mappings, and a payload that is generated by a non- VTL mapping template. You are making an assumption about the API Gateway retry policy which I believe is incorrect. I want to find a specific Amazon API Gateway REST API request failure in my Amazon CloudWatch logs. Jul 21, 2023 · Explore how to resolve the 503 Service Unavailable Error in AWS API Gateway and how to implement effective debugging strategies. It's a maze of regular expressions Nov 1, 2024 · Solve AWS API Gateway 502 errors with our guide. When I API gateway timeout implementation in AWS Let’s consider the following serverless project—the below diagram is a simplified version of the original project, that only highlights a few of the microservices under the AWS API Gateway. I am trying to return from my lambda any 5xx error code, I have tried everything I can, but the API gateway Feb 20, 2023 · I have an API Gateway to unite multiple services under one URL. 🚀You can securely and efficiently call the The Dark Side of the Moon API on APIPark in just two steps: Step 1: Deploy the APIPark AI gateway in 5 minutes. You can find more information about how that's done in the official API Gateway Introductory Blog post, most important is the Integration Response section. This section lists the client error codes that all Amazon EC2 API actions can return. Upon calling context. API Gateway では、API デベロッパーがカスタマイズできる以下のゲートウェイレスポンスを公開しています。 Feb 22, 2025 · This error is not specific to AWS API Gateway but is a standard HTTP status code that can occur in any web server environment. Centralized API Service Management With a centralized API service management system, teams can work cohesively around API call deliveries. Sep 8, 2024 · Unraveling the Mystery: Tackling 504 Errors from your AWS API Gateway It’s an ordinary day at work, I’ve just finished my new feature, my PR has been approved and I pushed the merge button Troubleshoot HTTP 502 error (Bad Gateway) from CloudFront. When I invoke the API method, my API returns an "Internal server error" and a 500 status code. Jul 21, 2023 · Uncover the causes behind the 404 Not Found Error in AWS API Gateway and find out how to debug these errors effectively with the right tools. The header is too large and due to Jan 20, 2025 · Examine API Gateway Metrics: Utilize the AWS API Gateway metrics to check for anomalies in usage patterns or unexpected spikes which could lead to issues. There are Nov 12, 2018 · Conclusion In this post, I showed you how to change the response status code of an API with the new override feature of API Gateway without modifying the API itself. The metrics and dimensions that API Gateway sends to Amazon CloudWatch are listed below. But here’s the catch: while AWS Feb 14, 2020 · I created an AWS Lambda function using Python 3. I don't know why this happens. If there is no match, API Gateway returns the error as a default response or throws an invalid configuration exception if no default response is configured. What Causes a 502 Bad Gateway Error? Feb 4, 2016 · Although CORS has been set up through API Gateway and the Access-Control-Allow-Origin header is set, I still receive the following error when attempting to call the Dec 21, 2024 · This ensures that any integration made with AWS API Gateway follows the appropriate guidelines and standards, thus minimizing errors. Amazon API Gateway is an AWS service for creating, publishing, maintaining, monitoring, and securing REST, HTTP, and WebSocket APIs at any scale. Apigateway › developerguide Set up an integration request in API Gateway Setting up integration requests in API Gateway involves key tasks like choosing integration type, specifying HTTP method and URI, setting IAM role with permissions, mapping parameters and request body, handling binary payloads, and enabling caching. Feb 7, 2024 · A Lambda monolith - that's a new one for me. The easiest way to set custom HTTP status code is to setup a Lambda Proxy Integration in API Gateway. status_code is the optional field for the resource aws_api_gateway_gateway_response but if you don't pass the status_code, it will show as status_code being changed in terraform plan. Apr 10, 2021 · I have a REST API in AWS API Gateway that invokes a Python Lambda function and returns some result. Navigate to Gateway Responses. You will need to use the response status code from your SpringMVC endpoint to control the API Gateway response. I'm using the aws-serverless-express example from awslabs. It acts as a front door for applications to access data, business logic, or functionality Nov 15, 2019 · The Lambda and API Gateway offerings from AWS have provided a powerful new mechanism for quickly developing REST APIs without the overhead of creating infrastructure and boilerplate code to spin May 26, 2017 · I am trying to call a Lambda Function through AWS API Gateway. I keep getting this error in web console when trying to interact Feb 3, 2025 · How to Change the "Missing Authentication Token" Response You can customize this response in API Gateway Gateway Responses by following these steps: Open your API Gateway in the AWS Console. May 16, 2019 · AWS API Gateway manages a selection of issues at the Gateway layer. It plays a crucial role in enabling serverless architectures by acting as an interface between front-end clients and backend services, such as AWS Lambda, HTTP services, or AWS Elastic Beanstalk. APIPark is developed based on Golang, offering strong product performance and low Programmatically, the method response setup amounts to creating a MethodResponse resource of API Gateway and setting the properties of statusCode, responseParameters, and responseModels. yml file that I am currently using AWSTemplateFormatVersion: '2010-09-09' Description: Basic HTTP API with request and response parameter mapping Resources: HTTPApi: May 9, 2022 · AWS API Gateway returns always 200 for all requests (success/error) in postman. I want to map the status codes returned by HTTP APIs in Amazon API Gateway? How do I troubleshoot API Gateway HTTP 504 status code timeout errors? Lists and describes the Amazon S3 error responses and their associated HTTP status codes. Customize HTTP API access logs API Gateway customization: Configure logging, JWT authorizers, CloudWatch metrics, gateway responses, Federated Identities, IAM resource access. Oct 28, 2015 · See official AWS Lambda Python Model Handler Types. These are things like returning 404s for none-existent resources or a 403 if the API is configured to use API keys and one is Sep 24, 2019 · I have an API running on ECS Fargate that accepts GET method requests. For errors specific to an API action for this service, see the topic for that API action. Most of the times this workflow works fine, meaning that the Lambda function is executed and pass Best practices for handling errors in AWS Lambda functions when working with API Gateway. In the API Gateway REST API, a gateway response is represented by the GatewayResponse. Issue: My API with a Lambda integration returns {"message":"Internal Server Error"} I configured Amazon API Gateway with virtual private cloud (VPC) link integrations. You also need API Gateway properly configured with your Integration Response. I've read many articles on how to customize the error message and code returned to end user when on authentication or authorization errors. My Amazon API Gateway custom domain name that has mutual Transport Layer Security (TLS) authentication activated returns HTTP 403 Forbidden errors. For Lambda "invoke" integrations, the error pattern against the the "errorMessage" field in the response. . Dec 6, 2017 · Create a api from API gateway in AWS management console and allow it to access to your lambda function. I configured Amazon API Gateway proxy integration to work with an AWS Lambda function. Within the expansive ecosystem of cloud computing, Amazon Web Services (AWS) API Gateway stands as a pivotal service, enabling developers to create, publish, maintain, Jul 21, 2023 · Learn how to handle the 409 Conflict Error in AWS API Gateway and discover effective debugging methods. Amazon API Gateway also returns some HTTP Errors and we will be discussing some of the errors in this blog post and what they mean when returned from the Amazon API Gateway. However, I May 2, 2022 · I am using a C# lambda to integrate with API gateway. Find and select "Missing Authentication Token". As an API developer, you decide how API Gateway responds to a mock integration request. For more information, see How can I troubleshoot API HTTP 504 timeout errors with API Gateway? Jun 6, 2022 · But TL:DR -> Api Gateway with a Lambda defaults to 200 response if the lambda successfully returns, only showing another status code if you specifically map it - and with Proxy Integrations, only if the lambda raised an exception I want to integrate an Amazon API Gateway endpoint with AWS Lambda, but I received an error. Amazon SQS receives the message and sends an answer to API Gateway with a success or failure code. From your example code, on a 404 from S3, your code would throw: Feb 22, 2025 · We will also touch upon how products like APIPark can streamline your API management tasks. Validate Configuration: Review API Gateway settings (such as integration type, HTTP method, and request/response settings) to ensure they are correctly configured. , JWT, OAuth2) and decide whether a request should be allowed or denied. Mar 23, 2019 · How to dig latencies and 4xx/5xx errors on AWS API Gateway When you create Serverless API/Applications, probably API Gateway and Lambda would be a common choice. com This section lists the errors common to the API actions of all AWS services. How do I troubleshoot this error? After I created an AWS Lambda authorizer for my Amazon API Gateway REST API, I receive "403 Forbidden" errors for API calls. When an API is called, different HTTP status codes are returned by the gateway to indicate whether the request was successfully completed. But, depending on your needs, a t3. To resolve this issue, activate an exponential backoff and retry mechanism, and then try the request again. Apr 2, 2019 · The API Gateway returned a 502 which means that it didn’t understand the output returned by Lambda and give you {“message”: “Internal server error”} 502. Oct 5, 2016 · amazon-web-services aws-lambda aws-api-gateway edited Oct 22, 2016 at 12:21 John Rotenstein 273k 28 456 541 After I created an AWS Lambda authorizer for my Amazon API Gateway API, I receive "401 Unauthorized" errors. To set the selectionPattern expression using the API Gateway console, enter the expression in the Lambda error regex text box when setting up or updating an integration response of a specified HTTP status code. I get "401 Unauthorized" errors in the API response. Read more! If you use Amazon API Gateway as your origin, the following is a possible cause for a 504 error: An integration request takes longer than your API Gateway REST API maximum integration timeout parameter. g. small runs about USD $15/month. Jun 4, 2018 · I have a custom authorizer for my Gateway API. If the response type is unspecified, this response defaults to the DEFAULT_4XX type. API Gateway exposes the following gateway responses for customization by API developers. Sep 30, 2024 · Avoiding 500 Internal Server Error in AWS API Gateway API calls requires a combination of proper coding practices, correct API Gateway configuration, and effective monitoring. When a Lambda function completes Why is AWS Lambda returning 200 OK status code responses in REST APIs? How do I map the status codes returned by REST APIs in Amazon API Gateway? -or- How do I map status codes in REST APIs? When you want to override your backend response status codes, use API Gateway mapping templates or regular expressions to map the status codes. Jan 13, 2020 · I have created a lambda instance, then used the 'automagic' button in lambda to create an http API gateway.