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HttpResponseHeaderCollection.Lookup | lookup method

Lookup an item in the HttpResponseHeaderCollection.

Syntax


var string = httpResponseHeaderCollection.lookup(key);

public:
String^ Lookup(
  String^ key
)

Parameters

key

Type: String [JavaScript] | Platform::String [C++]

The key of the item to lookup.

Return value

Type: String [JavaScript] | Platform::String [C++]

The value, if an item with the specified key exists. Use the HasKey method to determine whether the key exists.

Remarks

Use the HasKey method to determine whether the key exists in the HttpResponseHeaderCollection.

When programming with .NET, this method is hidden and developers should use the Item indexer.

Requirements (Windows 10 device family)

Device family

Universal, introduced version 10.0.10240.0

API contract

Windows.Foundation.UniversalApiContract, introduced version 1.0

Namespace

Windows.Web.Http.Headers
Windows::Web::Http::Headers [C++]

Metadata

Windows.Foundation.UniversalApiContract.winmd

Requirements (Windows 8.x and Windows Phone 8.x)

Minimum supported client

Windows 8.1

Minimum supported server

Windows Server 2012 R2

Minimum supported phone

Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]

Namespace

Windows.Web.Http.Headers
Windows::Web::Http::Headers [C++]

Metadata

Windows.winmd

See also

HttpResponseHeaderCollection