Fix headers comment, fix transfer-encoding value of streamingHeaders, update env var missing error name

Author: aryan-25

Sources/AWSLambdaRuntimeCore/NewLambdaRuntime.swift

@@ -35,7 +35,7 @@ package final class NewLambdaRuntime<Handler>: Sendable where Handler: Streaming
 
     package func run() async throws {
         guard let runtimeEndpoint = Lambda.env("AWS_LAMBDA_RUNTIME_API") else {
-            throw NewLambdaRuntimeError(code: .cannotStartLambdaRuntime)
+            throw NewLambdaRuntimeError(code: .missingLambdaRuntimeAPIEnvironmentVariable)
         }
 
         let ipAndPort = runtimeEndpoint.split(separator: ":", maxSplits: 1)

Sources/AWSLambdaRuntimeCore/NewLambdaRuntimeClient.swift

@@ -435,10 +435,11 @@ private final class LambdaChannelHandler<Delegate: LambdaChannelHandlerDelegate>
     private let delegate: Delegate
     private let configuration: NewLambdaRuntimeClient.Configuration
 
+    /// These are the default headers that must be sent along an invocation
     let defaultHeaders: HTTPHeaders
     /// These headers must be sent along an invocation or initialization error report
     let errorHeaders: HTTPHeaders
-    /// These headers must be sent along an invocation or initialization error report
+    /// These headers must be sent when streaming a response
     let streamingHeaders: HTTPHeaders
 
     init(delegate: Delegate, logger: Logger, configuration: NewLambdaRuntimeClient.Configuration) {
@@ -457,7 +458,7 @@ private final class LambdaChannelHandler<Delegate: LambdaChannelHandlerDelegate>
         self.streamingHeaders = [
             "host": "\(self.configuration.ip):\(self.configuration.port)",
             "user-agent": "Swift-Lambda/Unknown",
-            "transfer-encoding": "streaming",
+            "transfer-encoding": "chunked",
         ]
     }
 

Sources/AWSLambdaRuntimeCore/NewLambdaRuntimeError.swift

@@ -29,7 +29,7 @@ package struct NewLambdaRuntimeError: Error {
         case nextInvocationMissingHeaderDeadline
         case nextInvocationMissingHeaderInvokeFuctionARN
 
-        case cannotStartLambdaRuntime
+        case missingLambdaRuntimeAPIEnvironmentVariable
         case runtimeCanOnlyBeStartedOnce
         case invalidPort
     }