Merge pull request #140 from A-Shevchenko/patch-2

Update set-up-lambda-proxy-integrations.md

Author: mcdwil

doc_source/set-up-lambda-proxy-integrations.md

@@ -452,7 +452,6 @@ In Lambda proxy integration, API Gateway maps the entire client request to the i
 In the input:  
 The `headers` key can only contain single\-value headers\.
 The `multiValueHeaders` key can contain multi\-value headers as well as single\-value headers\.
-If you specify values for both `headers` and `multiValueHeaders`, API Gateway merges them into a single list\. If the same key\-value pair is specified in both, only the values from `multiValueHeaders` will appear in the merged list\.
 
 In the input to the backend Lambda function, the `requestContext` object is a map of key\-value pairs\. In each pair, the key is the name of a [$context](api-gateway-mapping-template-reference.md#context-variable-reference) variable property, and the value is the value of that property\. API Gateway may add new keys to the map\.
 
@@ -496,4 +495,4 @@ To return a response in a Lambda function in Node\.js, you can use commands such
 In a Lambda `async` function in Node\.js, the equivalent syntax would be:
 + To return a successful result, call `return {"statusCode": 200, "body": "results"}`\.
 + To throw an exception, call `throw new Error("internal server error")`\.
-+ For a client\-side error \(if, for example, a required parameter is missing\), you can call `return {"statusCode": 400, "body": "Missing parameters of ..."}` to return the error without throwing an exception\.
++ For a client\-side error \(if, for example, a required parameter is missing\), you can call `return {"statusCode": 400, "body": "Missing parameters of ..."}` to return the error without throwing an exception\.