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Git stops a merge when it cannot safely choose which competing content to keep. A Lambda HTTP 200, meanwhile, can confirm that an invocation request succeeded without confirming that the function completed successfully. In both cases, the key is to identify the decision the system made—and what its signal actually proves.
Why is Git refusing to merge?
Git automatically combines changes when it can do so without choosing between incompatible edits. If two branches change the same lines, or one changes a file that the other deletes, Git may not have a safe way to determine the intended final content. It stops and marks a conflict rather than silently picking a version. GitHub Docs describes the reason plainly: “Merge conflicts block merging because Git cannot safely choose which version of the conflicting content to keep.” See GitHub’s guide to merge conflicts.
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A conflict is not necessarily evidence that either branch is wrong. It means the merge needs an explicit decision about the content that should exist afterward. Review the conflicting versions, edit the result where necessary, then mark the conflict resolved and complete the merge. Some changes are straightforward; a complicated resolution may require local edits and a commit before you can push the result.
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First identify which interface returned the status. The direct Lambda Invoke API, API Gateway, and a Lambda Function URL have different response paths. A 200 from one is not interchangeable with a 200 from another.
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Direct Lambda Invoke API
For the Lambda Invoke API, the invocation type determines what the response represents:
| Invocation type | What the caller gets | What the status establishes |
|---|---|---|
RequestResponse |
The caller waits for processing and receives a result. | HTTP 200 indicates the synchronous invocation request succeeded at the API level. Check FunctionError and the response payload to determine whether the function reported an error. |
Event |
The event is queued for asynchronous processing; the caller receives an immediate response rather than the eventual function result. | HTTP 202 indicates that the asynchronous invocation request was accepted, not that processing later succeeded. |
DryRun |
Lambda validates the invocation parameters and permissions without running the function. | HTTP 204 indicates that the validation request succeeded; it is not evidence of function execution. |
A function error and an invocation-request error are different layers. With synchronous invocation, inspect the returned FunctionError field and payload in addition to the HTTP status. For asynchronous invocation, the initial response cannot report the eventual processing result; use the logs or a separate result path to establish what happened. AWS explains the distinction between synchronous and asynchronous invocation.
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API Gateway integrations
For an API Gateway REST API using a non-proxy Lambda integration, invocation is synchronous by default. The integration can instead use X-Amz-Invocation-Type set to Event for asynchronous invocation. In that case, the front-end method does not return the Lambda processing result. The exact integration and response mapping matter; do not assume this behavior applies identically to every API Gateway configuration. See AWS’s instructions for asynchronous Lambda invocation with API Gateway and its overview of API Gateway and Lambda request and response behavior.
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Lambda Function URLs
A Function URL turns the function’s response into an HTTP response. If the function returns valid JSON without a statusCode, Lambda assumes status 200. That status therefore reflects the Function URL’s response handling; it is not by itself proof that the application performed the intended work. The response body and function behavior still matter. AWS documents this conversion in its guide to invoking Lambda through Function URLs.
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How to tell what actually happened
- Identify the caller and endpoint. Establish whether the response came from the Lambda Invoke API, an API Gateway route, or a Function URL.
- Determine the invocation mode. A synchronous request can return a function result; an asynchronous request acknowledges accepted work before its eventual outcome is known.
- Inspect the right evidence. For direct synchronous Invoke, check
FunctionErrorand the payload as well as HTTP status. For background work, correlate logs or use the system’s later result channel. - Keep the signals separate. A Git conflict asks a person to decide the final merged content. An HTTP status reports something about a particular request or response path; interpret it only within that path’s semantics.
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