rujmah · January 25, 2019 09:16 · Jan 25, 2019 · Jan 25, 2019 · Jan 25, 2019 · Jan 24, 2019
diff --git a/README.md b/README.md
@@ -36,4 +36,4 @@ This was apparently due to the fact that regardless of the actual `HttpMethod` w
 
 https://docs.amazonaws.cn/en_us/apigateway/latest/developerguide/set-up-lambda-custom-integrations.html
 
-> For Lambda integrations, you must use the HTTP method of POST for the integration request, according to the specification of the Lambda service action for function invocations. The uri parameter is the ARN of the function-invoking action.
+> For Lambda integrations, you must use the HTTP method of POST for the integration request, according to the specification of the Lambda service action for function invocations. 
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# AWS API Gateway that calls an single endpoint
+# AWS API Gateway that calls an single endpoint Lambda with GET
 
 ## Pertinent info
 

diff --git a/README.md b/README.md
@@ -32,4 +32,8 @@ error message when attempting to use `GET` methods:
 </AccessDeniedException>
 ```
 
-This was apparently due to the fact that regardless of the actual `HttpMethod` we set, `IntegrationHttpMethod` needs to be set to `POST`
+This was apparently due to the fact that regardless of the actual `HttpMethod` we set, `IntegrationHttpMethod` needs to be set to `POST` as per this piece of AWS documentation:
+
+https://docs.amazonaws.cn/en_us/apigateway/latest/developerguide/set-up-lambda-custom-integrations.html
+
+> For Lambda integrations, you must use the HTTP method of POST for the integration request, according to the specification of the Lambda service action for function invocations. The uri parameter is the ARN of the function-invoking action.
diff --git a/README.md b/README.md
@@ -0,0 +1,35 @@
+# AWS API Gateway that calls an single endpoint
+
+## Pertinent info
+
+Ensure `IntegrationHttpMethod` is set to `POST` even if you want to use a `GET` (or whatever)
+
+e.g.
+```
+  rootMethod:
+    Type: AWS::ApiGateway::Method
+    Properties:
+      AuthorizationType: NONE
+      HttpMethod: GET
+      Integration:
+        IntegrationHttpMethod: POST
+        Type: AWS_PROXY
+        Uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
+      ResourceId: !GetAtt apiGateway.RootResourceId
+      RestApiId: !Ref apiGateway
+```
+
+See this thread: https://forums.aws.amazon.com/thread.jspa?messageID=745275
+
+## Background
+
+When attempting to set up an API Gateway with a single endpoint that used a Lambda we continually got the following 
+error message when attempting to use `GET` methods:
+
+```
+<AccessDeniedException>
+  <Message>Unable to determine service/operation name to be authorized</Message>
+</AccessDeniedException>
+```
+
+This was apparently due to the fact that regardless of the actual `HttpMethod` we set, `IntegrationHttpMethod` needs to be set to `POST`
diff --git a/apigateway_cfn.yml b/apigateway_cfn.yml
@@ -0,0 +1,43 @@
+AWSTemplateFormatVersion: "2010-09-09"
+Description: Test API G setup
+
+Parameters:
+  lambdaArn:
+    Type: "String"
+    Default: arn:aws:lambda:eu-west-1:xxxxxxxxxx:function:xxxxxxxxxx
+
+Resources:
+  apiGateway:
+    Type: AWS::ApiGateway::RestApi
+    Properties:
+      Name: rjjmTestApiGateway
+      Description: "Test API Gateway"
+
+  rootMethod:
+    Type: AWS::ApiGateway::Method
+    Properties:
+      AuthorizationType: NONE
+      HttpMethod: GET
+      Integration:
+        IntegrationHttpMethod: POST
+        Type: AWS_PROXY
+        Uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
+      ResourceId: !GetAtt apiGateway.RootResourceId
+      RestApiId: !Ref apiGateway
+
+  deployment:
+    Type: AWS::ApiGateway::Deployment
+    DependsOn: rootMethod
+    Properties:
+      RestApiId: !Ref apiGateway
+      StageName: v1
+
+  lambdaApiGatewayInvoke:
+    Type: AWS::Lambda::Permission
+    Properties:
+      Action: lambda:InvokeFunction
+      FunctionName: !Ref lambdaArn
+      Principal: apigateway.amazonaws.com
+      SourceArn: !Sub "arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${apiGateway}/*"
+
+