Unable to transform request to binary - aws-api-gateway

Question

To implement binary support in api-gateway for file upload, i have used serverless-apigw-binary plugin and added necessary content types which should be converted by api-gateway.
This is my serverless.ymlfile
service: aws-java-gradle
provider:
name: aws
runtime: java8
stage: dev
region: us-east-1
custom:
apigwBinary:
types:
- 'application/pdf'
plugins:
- serverless-apigw-binary
package:
artifact: build/distributions/hello.zip
functions:
uploadLoadFiles:
handler: com.serverless.UploadFileHandler
role: UploadFileRole
timeout: 180
events:
- http:
integration: lambda
path: upload
method: put
cors:
origin: '*'
headers:
- Content-Type
- X-Amz-Date
- Authorization
- X-Api-Key
- X-Amz-Security-Token
- X-Amz-User-Agent
- X-Requested-With
allowCredentials: false
request:
passThrough: WHEN_NO_TEMPLATES
template:
application/pdf: '{ "operation":"dev-aws-java-gradle", "base64Image": "$input.body", "query": "$input.params("fileName")" }'
response:
template: $input.body
statusCodes:
400:
pattern: '.*"httpStatus":400,.*'
template: ${file(response-template.txt)}
401:
pattern: '.*"httpStatus":401,.*'
template: ${file(response-template.txt)}
403:
pattern: '.*"httpStatus":403,.*'
template: ${file(response-template.txt)}
500:
pattern: '.*"httpStatus":500,.*'
template: ${file(response-template.txt)}
501:
pattern: '.*[a-zA-Z].*'
template: ${file(unknown-error-response-template.txt)}
environment:
S3BUCKET: ${env:S3_BUCKET}
APS_ENV: ${env:APS_ENV}
# you can add CloudFormation resource templates here
resources:
Resources:
UploadFileRole:
Type: AWS::IAM::Role
Properties:
RoleName: "UploadFileRole"
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action: sts:AssumeRole
Policies:
- PolicyName: loggingPolicy
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action:
- logs:CreateLogGroup
- logs:CreateLogStream
- logs:PutLogEvents
Resource:
- 'Fn::Join':
- ':'
-
- 'arn:aws:logs'
- Ref: 'AWS::Region'
- Ref: 'AWS::AccountId'
- 'log-group:/aws/lambda/*:*:*'
all the necessary settings got implemented in api-gateway after doing sls deploy
(checked based on this article https://aws.amazon.com/blogs/compute/binary-support-for-api-integrations-with-amazon-api-gateway/)
but when i hit my end point api gateway is giving out an error like this
Verifying Usage Plan for request: 45bac722-f039-11e7-bcc6-f9a1aa509052. API Key: API Stage: fd4ue8lpia/int
API Key authorized because method 'PUT /upload' does not require API Key. Request will not contribute to throttle or quota limits
Usage Plan check succeeded for API Key and API Stage fd4ue8lpia/int
Starting execution for request: 45bac722-f039-11e7-bcc6-f9a1aa509052
HTTP Method: PUT, Resource Path: /upload
Method request path:
{}
Method request query string:
{}
Method request headers: {Accept=*/*, CloudFront-Viewer-Country=IN, postman-token=6f1a23ba-36c2-104d-2e12-dc2c76a985ee, CloudFront-Forwarded-Proto=https, CloudFront-Is-Tablet-Viewer=false, origin=chrome-extension://aicmkgpgakddgnaphhhpliifpcfhicfo, CloudFront-Is-Mobile-Viewer=false, User-Agent=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36, X-Forwarded-Proto=https, CloudFront-Is-SmartTV-Viewer=false, Host=fd4ue8lpia.execute-api.us-east-1.amazonaws.com, Accept-Encoding=gzip, deflate, br, X-Forwarded-Port=443, X-Amzn-Trace-Id=Root=1-5a4c530e-2c1927f85440b71b66cf0c15, Via=2.0 fc18daf68173838631b562fe2efaf8f8.cloudfront.net (CloudFront), x-postman-interceptor-id=8fa8440f-0541-fdac-c60c-6019c2269a66, X-Amz-Cf-Id=P4PYoi5Wwb-NCYRSdTQ_5TdtpbQLBaEATXoyJGC7cS8g6LsoCRPbkg==, X-Forwarded-For=157.50.20.12, 52.46.37.156, content-type=application/pdf, Accept-Language=en-US,en;q=0.9, cache-control=no-cache, CloudFront-Is-Desktop-Viewer=true}
Method request body before transformations: [Binary Data]
Execution failed due to configuration error: Unable to transform request
Method completed with status: 500
and the request is not crossing api-gateway to lambda function.
But i followed a solution mentioned here
to edit lambda function name in integration request section of resource in api-gateway to the same name and click ok. Then error's were gone and working fine.
I checked for changes in roles after doing that but none were found.
Can any one suggest what could have happened there, and any better solutions for the above mentioned problem.
Thanks in advance.

Answer 1

But i followed a solution mentioned here to edit lambda function name
in integration request section of resource in api-gateway to the same
name and click ok. Then error's were gone and working fine.
When you edit lambda function on the console, it sets up the permissions to call the lambda function automatically. If you want to do that manually, you can do that using the CLI