requests to /foo/bar to an API Gateway (v1) resource of /foo/{proxy+} return 404 as they are routed to /bar

[eran-medan]

I'm having the same issue as in this comment #454 (comment) (should be probably reopened?)

Upgraded from the legacy aws-serverless-express and for some reason it takes the path from pathParameters.proxy (which is bar) and not the request.path (which is /foo/bar)

I'll be happy to work on a PR if you indeed confirm it's a bug

[pocketcowboy]

Offending line is https://github.com/vendia/serverless-express/blob/0909ec4ffd09d9fd22538257b721b7d076d03732/src/event-sources/utils.js#LL7C21-L7C21

A quick workaround is to change the name of the greedy path variable in API Gateway e.g. rename {proxy+} to {route+}.

[mohammedsahl]

Facing the same issue as well. My team wasn't keen on messing with the greedy path variable names since that would entail a relatively uncomfortable change in API Gateway. Our routes are well established and running well.

Another quick workaround is to delete event.pathParameters.proxy if it exists and pass the edited event into serverlessExpress. This way util.js is forced to use event.path.

[hisham]

To add to @mohammedsahl comment - vendia v4 does not seem to be compatible with how AWS Amplify sets up REST endpoints in API Gateway (https://docs.amplify.aws/cli/restapi/restapi/#create-a-rest-api). Since AWS Amplify allows for varying auth levels per endpoint, and the auth checks are done by API Gateway, it uses /foo/{proxy+} rather than /{proxy+}.

To make this lib work with amplify, you have to do what @mohammedsahl describes in #648 (comment) or similar.

[brett-vendia]

Can you try the v5 branch #649? We'll merge this after additional verification

[mohammedsahl]

Hey @brett-vendia. Unfortunately, it still doesn't seem to work. This event.multiValueQueryStringParameters in our event is null and so the params passed to to url.format() are { pathname: '/<somePathParamter>', query: null }

If it helps our event has the following structure

{
  "resource": "/foo/{proxy+}",
  "path": "/foo/<PathParamter>",
  ...
  "queryStringParameters": null,
  "multiValueQueryStringParameters": null,
  "pathParameters": {
    "proxy": "<PathParamter>"
  },
  ...
}

[ddewaele]

any updates on this ?

It's a bit unclear why paths are treated so differently.

API GW Resource	API call	NestJS incoming path	NestJS path logic
/api/{proxy+}	/api/dynamic	dynamic	pathParameters.proxy
/api/static	/api/static	/api/static	path
/{proxy+}	/api/dynamic	/api/dynamic	pathParameters.proxy

Given the 2 following events that API GW sends to Lambda proxy integration perhaps an option to prefer the path property over or the proxy property could be considered if people prefer this type of consistency.

Would happy to offer a PR for this if this is a direction you are interested in.

"resource": "/api/{proxy+}",
"path": "/api/dynamic",
"pathParameters": {
  "proxy": "dynamic"
},
"requestContext": {
  "resourcePath": "/api/{proxy+}",
  "path": "/prod/api/dynamic",
}

vs

"resource": "/api/static",
"path": "/api/static",
"pathParameters": null,
"requestContext": {
  "resourcePath": "/api/static",
  "path": "/prod/api/static",
}

I also don't think proxy is reserved or special keyword. As others pointed out, if could just as well be called {route+}.
So it's probably best avoided in code.

[shrinarpatvfx]

Facing the same issue in July 2024 - Do we have found any solution for this bug?

[ferborgo]

Facing the same issue in March 2025. Any updates on this?

I tried this comment, and it worked fine. Here’s what I did:

const serverlessExpress = require('@codegenie/serverless-express');
import app from "./app";

exports.handler = async (event, context) => {
    // Deleting this property resolves the issue
    if (event.pathParameters?.proxy) {
        delete event.pathParameters.proxy;
    }

    return serverlessExpress({ app })(event, context);
};

It would be great to have a proper fix for this, though.