Form enhance not working when I am using adapter-lambda

[santhoshoutright]

See the screenshot below for example formEnhance action form submission not working.

[yarbsemaj]

Hi @santhoshoutright , thank you for your interest in my project,

I believe the issue may be due to the x-sveltekit-action header been missing from your allowed header list within serverless.yml, could you try adding this and retesting. If this is the issue, ill add this into the repo

[santhoshoutright]

@yarbsemaj Thank you for making this Adapter and yes, I tried adding x-sveltekit-action still form-enhance not working as expected.

Below is my serverless.yml file configuration:

       service: "your_app_name"
            
      frameworkVersion: "3"
      
      plugins:
        - "@silvermine/serverless-plugin-cloudfront-lambda-edge"
        - serverless-s3-deploy
      
      provider:
        name: aws
        runtime: nodejs18.x
        lambdaHashingVersion: 20201221
        region: us-east-1 #Lambda@Edge must be deployed in us-east-1
        stage: ${opt:stage, 'dev'}
        environment:
          BASE_URL: "you_app_backend"
          VITE_BASE_URL: "you_app_backend"
      
      package:
        individually: true
        exclude:
          - ./**
        include:
          - build/server/**
          - build/edge/**
          - build/assets/**
          - build/prerendered/**
      
      custom:
        assets:
          auto: true
          targets:
            - bucket:
                Ref: StaticAssets
              files:
                - source: ./build/assets/
                  globs:
                    - "**"
                  empty: true
                  headers:
                    CacheControl: max-age=31104000
                - source: ./build/prerendered/
                  globs:
                    - "**"
                  empty: true
                  headers:
                    CacheControl: max-age=60
      
      functions:
        #SSR Function
        svelte:
          handler: build/server/serverless.handler
          memorySize: 256
          timeout: 15
          url: true
      
        #Router Function
        cfLambda:
          handler: build/edge/router.handler
          memorySize: 128
          timeout: 1
          lambdaAtEdge:
            distribution: "WebsiteDistribution"
            eventType: origin-request
      
      resources:
        Resources:
          StaticAssets:
            Type: AWS::S3::Bucket
            Properties:
              BucketName: ${self:provider.stage}-${self:service}-static-assets
              OwnershipControls:
                Rules:
                  - ObjectOwnership: BucketOwnerPreferred
              PublicAccessBlockConfiguration:
                BlockPublicAcls: false
                BlockPublicPolicy: false
                IgnorePublicAcls: false
                RestrictPublicBuckets: false
      
          StaticAssetsS3BucketPolicy:
            Type: AWS::S3::BucketPolicy
            Properties:
              Bucket:
                Ref: StaticAssets
              PolicyDocument:
                Statement:
                  - Sid: PublicReadGetObject
                    Effect: Allow
                    Principal: "*"
                    Action:
                      - s3:GetObject
                    Resource:
                      Fn::Join:
                        ["", ["arn:aws:s3:::", { "Ref": "StaticAssets" }, "/*"]]

    WebsiteDistribution:
      Type: "AWS::CloudFront::Distribution"
      Properties:
        DistributionConfig:
          Origins:
            - DomainName:
                !Select [
                  2,
                  !Split [
                    "/",
                    !GetAtt ["SvelteLambdaFunctionUrl", "FunctionUrl"],
                  ],
                ]
              Id: default
              OriginCustomHeaders:
                #Lambda@edge does not support ENV vars, so instead we have to pass in a customHeaders.
                - HeaderName: "s3-host"
                  HeaderValue: "${self:provider.stage}-${self:service}-static-assets.s3.amazonaws.com"
              CustomOriginConfig:
                HTTPPort: 80
                HTTPSPort: 443
                OriginProtocolPolicy: "https-only"
          Enabled: true
          Comment: "${self:service}_${self:provider.stage}"
          DefaultCacheBehavior:
            TargetOriginId: default
            Compress: true
            AllowedMethods:
              - DELETE
              - GET
              - HEAD
              - OPTIONS
              - PATCH
              - POST
              - PUT
            CachedMethods:
              - GET
              - HEAD
              - OPTIONS
            ForwardedValues:
              Headers:
                - x-forwarded-host
                - x-sveltekit-action  # Add this line to include x-sveltekit-action header
              Cookies:
                Forward: all
              QueryString: True
            ViewerProtocolPolicy: "redirect-to-https"
            FunctionAssociations:
              - EventType: viewer-request
                FunctionARN: !GetAtt XForwardFunction.FunctionMetadata.FunctionARN

    XForwardFunction:
      Type: AWS::CloudFront::Function
      Properties:
        AutoPublish: true
        Name: "${self:provider.stage}-${self:service}-XForwardFunction"
        FunctionCode: !Sub |
          function handler(event) {
            event.request.headers['x-forwarded-host'] = event.request.headers['host']
            return event.request
          }
        FunctionConfig:
          Comment: "Add x-forwarded-host"
          Runtime: cloudfront-js-1.0