System.Net.Http.Headers.HttpContentHeaders.AddKnownHeaders C# (CSharp) Method

        internal static void AddKnownHeaders(HashSet<string> headerSet)
        {
            Debug.Assert(headerSet != null);

            headerSet.Add(HttpKnownHeaderNames.Allow);
            headerSet.Add(HttpKnownHeaderNames.ContentDisposition);
            headerSet.Add(HttpKnownHeaderNames.ContentEncoding);
            headerSet.Add(HttpKnownHeaderNames.ContentLanguage);
            headerSet.Add(HttpKnownHeaderNames.ContentLength);
            headerSet.Add(HttpKnownHeaderNames.ContentLocation);
            headerSet.Add(HttpKnownHeaderNames.ContentMD5);
            headerSet.Add(HttpKnownHeaderNames.ContentRange);
            headerSet.Add(HttpKnownHeaderNames.ContentType);
            headerSet.Add(HttpKnownHeaderNames.Expires);
            headerSet.Add(HttpKnownHeaderNames.LastModified);
        }
    }

        static HttpRequestHeaders()
        {
            parserStore = new Dictionary <string, HttpHeaderParser>(StringComparer.OrdinalIgnoreCase);

            parserStore.Add(HttpKnownHeaderNames.Accept, MediaTypeHeaderParser.MultipleValuesParser);
            parserStore.Add(HttpKnownHeaderNames.AcceptCharset, GenericHeaderParser.MultipleValueStringWithQualityParser);
            parserStore.Add(HttpKnownHeaderNames.AcceptEncoding, GenericHeaderParser.MultipleValueStringWithQualityParser);
            parserStore.Add(HttpKnownHeaderNames.AcceptLanguage, GenericHeaderParser.MultipleValueStringWithQualityParser);
            parserStore.Add(HttpKnownHeaderNames.Authorization, GenericHeaderParser.SingleValueAuthenticationParser);
            parserStore.Add(HttpKnownHeaderNames.Expect, GenericHeaderParser.MultipleValueNameValueWithParametersParser);
            parserStore.Add(HttpKnownHeaderNames.From, GenericHeaderParser.MailAddressParser);
            parserStore.Add(HttpKnownHeaderNames.Host, GenericHeaderParser.HostParser);
            parserStore.Add(HttpKnownHeaderNames.IfMatch, GenericHeaderParser.MultipleValueEntityTagParser);
            parserStore.Add(HttpKnownHeaderNames.IfModifiedSince, DateHeaderParser.Parser);
            parserStore.Add(HttpKnownHeaderNames.IfNoneMatch, GenericHeaderParser.MultipleValueEntityTagParser);
            parserStore.Add(HttpKnownHeaderNames.IfRange, GenericHeaderParser.RangeConditionParser);
            parserStore.Add(HttpKnownHeaderNames.IfUnmodifiedSince, DateHeaderParser.Parser);
            parserStore.Add(HttpKnownHeaderNames.MaxForwards, Int32NumberHeaderParser.Parser);
            parserStore.Add(HttpKnownHeaderNames.ProxyAuthorization, GenericHeaderParser.SingleValueAuthenticationParser);
            parserStore.Add(HttpKnownHeaderNames.Range, GenericHeaderParser.RangeParser);
            parserStore.Add(HttpKnownHeaderNames.Referer, UriHeaderParser.RelativeOrAbsoluteUriParser);
            parserStore.Add(HttpKnownHeaderNames.TE, TransferCodingHeaderParser.MultipleValueWithQualityParser);
            parserStore.Add(HttpKnownHeaderNames.UserAgent, ProductInfoHeaderParser.MultipleValueParser);

            HttpGeneralHeaders.AddParsers(parserStore);

            invalidHeaders = new HashSet <string>(StringComparer.OrdinalIgnoreCase);
            HttpContentHeaders.AddKnownHeaders(invalidHeaders);
            // Note: Reserved response header names are allowed as custom request header names.  Reserved response
            // headers have no defined meaning or format when used on a request.  This enables a server to accept
            // any headers sent from the client as either content headers or request headers.
        }