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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-7800A00C-5BD3-46FA-9D0A-9DF29A5C057E" xml:lang="en"><title>Specific
header formats</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>This section describes the headers that have specific support for encoding
or decoding using parts and parameters. Other headers not listed are encoded
and decoded using a default mechanism that assumes the header field has a
single part with a string value. </p>
<section id="GUID-210B3CBF-2885-434C-A8DF-418D5A986088"><title>Accept</title> <p>This
is a client request header. </p><codeblock id="GUID-1AB0D534-093B-5B81-A80D-D9002A5BA886" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Setting a single media range with no parameter, i.e. Accept: text/html 
RStringF textHtml = iStrTb.OpenFStringL(_L8("text/html")); 
CleanupClosePushL(textHtml);
THTTPHdrVal accVal(textHtml); 
hdr.SetFieldL(iStrTb.String(HTTP::EAccept,RHTTPSession::GetTable()), accVal); 
CleanupStack::PopAndDestroy(&amp;textHtml);
// Setting several media ranges with no parameters, i.e. Accept: text/html; text/vnd.wap.wml 
RStringF textHtml = iStrTb.OpenFStringL(_L8("text/html")); 
CleanupClosePushL(textHtml);
RStringF textWml  = iStrTb.OpenFStringL(_L8("text/vnd.wap.wml")); 
CleanupClosePushL(textWml);
THTTPHdrVal accVal(textHtml);
hdr.SetFieldL(iStrTb.String(HTTP::EAccept,RHTTPSession::GetTable()), accVal); 
accVal.SetStr(textWml); 
hdr.SetFieldL(iStrTb.String(HTTP::EAccept,RHTTPSession::GetTable()), accVal); 
CleanupStack::PopAndDestroy(&amp;textHtml);
CleanupStack::PopAndDestroy(&amp;textWml);
// Setting a media range with a 'q' parameter,  Accept: text/html; q=0.8 
RStringF textHtml  = iStrTb.OpenFStringL(_L8("text/html")); 
CleanupClosePushL(textHtml);
THTTPHdrVal accVal(textHtml); 
THTTPHdrVal q(THTTPHdrVal::TQConv(0.8)); 
hdr.SetFieldL(iStrTb.String(HTTP::EAccept,RHTTPSession::GetTable()), accVal, iStrTb.String(HTTP::EQ,RHTTPSession::GetTable()), q); 
CleanupStack::PopAndDestroy(&amp;textHtml);
// Using an accept extension,  Accept: text/html; extended=value 
RStringF textHtml  = iStrTb.OpenFStringL(_L8("text/html")); 
CleanupClosePushL(textHtml);
RStringF extended  = iStrTb.OpenFStringL(_L8("extended")); 
CleanupClosePushL(extended);
RStringF extendVal = iStrTb.OpenFStringL(_L8("value")); 
CleanupClosePushL(extendVal);

THTTPHdrVal accVal(textHtml); 
THTTPHdrVal extVal(extendVal); 

hdr.SetFieldL(iStrTb.String(HTTP::EAccept,RHTTPSession::GetTable()), accVal, extended, extVal); 
CleanupStack::PopAndDestroy(3); // textHtml, extended, extendVal</codeblock> 
   </section>
<section id="GUID-37A82EFB-820A-4BD0-BA38-F3507F709E73"><title>Accept-Charset</title><p>This is a client request header. </p><codeblock id="GUID-EE14D9C1-1EEE-56FF-91F0-2B3BB8455A65" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Setting up two accepted character sets, i.e.  Accept-Charset: us-ascii, utf-8 
RStringF usAscii = iStrTb.OpenFStringL(_L8("us-ascii"));
CleanupClosePushL(usAscii);
RStringF utf8 = iStrTb.OpenFStringL(_L8("utf-8"));
CleanupClosePushL(utf8);
THTTPHdrVal accChSetVal(usAscii);
hdr.SetFieldL(iStrTb.String(HTTP::EAcceptCharset,RHTTPSession::GetTable()), accChSetVal);
// sets the first part accChSetVal.(SetStrutf8);
hdr.SetFieldL(iStrTb.String(HTTP::EAcceptCharset,RHTTPSession::GetTable()), accChSetVal);
// adds an additional part usAscii.Close();
CleanupStack::PopAndDestroy(2);</codeblock></section>
<section id="GUID-28FB5629-78CC-4229-B30D-6EF40F8E3C33"><title>Authorisation</title><p>This is a client request header. <b>Note:</b> The
client need not set this header for most normal requests. </p><codeblock id="GUID-5D430FE4-8EE4-5537-818F-B7C9EBFC923D" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Setting an authorization credential, i.e. Authorization: Basic c3ltYmlhbjpmMXN5bmNtbA== 
RStringF basicCred = iStrTb.OpenFStringL(_L8("c3ltYmlhbjpmMXN5bmNtbA=="));
CleanupClosePushL(basicCred);
THTTPHdrVal authVal(iStrTb.String(HTTP::EBasic,RHTTPSession::GetTable()));
hdr.SetFieldL(iStrTb.String(HTTP::EAuthorization,RHTTPSession::GetTable()), authVal);
authVal.(SetStrbasicCred);
hdr.SetFieldL(iStrTb.String(HTTP::EAuthorization,RHTTPSession::GetTable()), authVal);
CleanupStack::PopAndDestroy(&amp;basicCred);</codeblock></section>
<section id="GUID-64B95F8D-3E6D-48F6-A7E1-C997C69F5C6A"><title>Connection</title><p>This is a general header, that is, it
applies to the connection between client and server. <b>Note:</b> The client
need not set this header for normal, persistent HTTP/1.1 requests. </p><codeblock id="GUID-96A98445-2D81-555B-A727-CA364F906F04" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Indicate that the connection is to close, i.e. Connection: close 
THTTPHdrVal closeVal(iStrTb.String(HTTP::EClose,RHTTPSession::GetTable()));
hdr.SetFieldL(iStrTb.String(HTTP::EConnection,RHTTPSession::GetTable()), closeVal);
</codeblock></section>
<section id="GUID-8F6F6A87-0C05-4635-BBCD-72B5E4AFB3CC"><title>Content-Length</title><p>This is an entity header, that is,
it applies to the body present in a request or a response. <b>Note:</b> The
client should not set this header for any request: it will be ignored. </p><codeblock id="GUID-58334818-7616-50EA-9862-2701610EB12D" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Set a content length of 12345, i.e. Content-Length: 12345 
THTTPHdrVal lengthVal(12345);
hdr.SetFieldL(iStrTb.String(HTTP::EContentLength,RHTTPSession::GetTable()), lengthVal);
</codeblock></section>
<section id="GUID-6639232A-25C9-4CB6-9FF3-7F1EF3D8E148"><title>Content-Type</title><p>This is an entity header, that is,
it applies to the body present in a request or a response. </p><codeblock id="GUID-8BCE3E31-E6A6-5908-AF87-A1CA6591D223" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Set a content type of text/html, i.e. Content-Type: text/html 
THTTPHdrVal contTypeVal(iStrTb.String(HTTP::ETextHtml,RHTTPSession::GetTable()));
hdr.SetFieldL(iStrTb.String(HTTP::EContentType,RHTTPSession::GetTable()), contTypeVal);
</codeblock></section>
<section id="GUID-897C8418-2567-4739-8AFE-BE14A2FBC07D"><title>Date</title><p>This is a general header, that is, it applies
to the connection between client and server. All three date formats specified
in RFC2616 are supported in responses. Requests will be made using the RFC1123
format only. </p><codeblock id="GUID-DE554314-FFAD-5807-B83E-70151BE366B0" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Set a date of 9th August 2001, time 13:45:00.000, i.e. Date: Thu, 09 Aug 2001 13:45:00 GMT 
THTTPHdrVal dateVal(TDateTime(2001, EAugust, 8, 13, 45, 0, 0));
// note, the day starts at 0 
hdr.SetFieldL(iStrTb.String(HTTP::EDate,RHTTPSession::GetTable()), dateVal);
</codeblock></section>
<section id="GUID-D1120183-9158-44D6-B64B-A9D8263B7174"><title>Host</title><p>This is a client request header. <b>Note:</b> The
client should not set this header for any request unless the URL is relative. </p><codeblock id="GUID-A20C80EF-185A-57EF-9F36-D547D5E458C0" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Set a host 'www.symbian.com', i.e. Host: www.symbian.com 
_LIT8(host, "www.symbian.com");
RStringF hostValStr = iStrTb.OpenFStringL(host);
CleanupClosePushL(hostValStr);   
THTTPHdrVal hostVal(hostValStr);    
hdr.SetFieldL(hostStr, hostVal);
CleanupStack::PopAndDestroy(&amp;hostValStr);</codeblock></section>
<section id="GUID-8AA02D22-54A6-4250-9350-D9DE3B0E93B5"><title>Transfer-Encoding</title><p>This is a general header, that
is, it applies to the connection between client and server. <b>Note:</b> The
client should not set this header for any request, as it will be ignored. </p><codeblock id="GUID-868090A3-4534-54DE-8B46-B19BA4077B10" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Set the transfer encoding to be 'chunked', i.e. Transfer-Encoding: chunked 
THTTPHdrVal xferEncVal;
xferEncVal.SetStrF(iStrTb.StringF(HTTP::EChunked,RHTTPSession::GetTable()));
hdr.SetFieldL(iStrTb.StringF(HTTP::ETransferEncoding,RHTTPSession::GetTable()), xferEncVal);
</codeblock></section>
<section id="GUID-E3C924A2-E426-496E-BFDD-BA6E85E40F09"><title>User-Agent</title><p>This is a client request header. </p> <codeblock id="GUID-987775EF-4346-57C3-84DB-4C05683DD5D8" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
// Set up a user agent with two part, i.e. User-Agent: CERN-LineMode/2.15 libwww/2.17b3 
RStringF ua1Str = iStrP.OpenFStringL(_L8("CERN-LineMode/2.15"));
CleanupClosePushL(ua1Str);
RStringF ua2Str = iStrP.OpenFStringL(_L8("libwww/2.17b3"));
CleanupClosePushL(ua2Str);
RStringF uaStr = iStrP.StringF(HTTP::EUserAgent,RHTTPSession::GetTable());
THTTPHdrVal uaVal(ua1Str);
hdr.SetFieldL(uaStr, uaVal);
// sets part 1 uaVal.SetStrF(ua2Str);
hdr.SetFieldL(uaStr, uaVal);
// sets part 2
CleanupStack::PopAndDestroy(2);</codeblock></section>
<section id="GUID-8127BB03-00A9-4815-83F8-69838862B17A"><title>WWW-Authenticate</title><p>This is a server response header. <b>Note:</b> The
client need not read this header for most normal responses. </p> <codeblock id="GUID-5ED4C598-80E5-5514-A616-AFCA5D1D4002" xml:space="preserve">RHTTPHeaders hdr = aReq.GetHeaderCollection();
...
// Display realm for WWW-Authenticate header 
RStringF wwwAuth = strP.StringF(HTTP::EWWWAuthenticate,RHTTPSession::GetTable());
            if (fieldNameStr == wwwAuth)
                {
                // check the auth scheme is 'basic'
                RStringF basic = strP.StringF(HTTP::EBasic,RHTTPSession::GetTable());
                RStringF realm = strP.StringF(HTTP::ERealm,RHTTPSession::GetTable());
                THTTPHdrVal realmVal;
                if ((fieldVal.StrF() == basic) &amp;&amp; 
                    (!hdr.GetParam(wwwAuth, realm, realmVal)))
                    {
                    RStringF realmValStr = strP.StringF(realmVal.StrF());
                    fieldVal16.Copy(realmValStr.DesC());
                    iUtils.Test().Printf(_L("Realm is: %S\n"), &amp;fieldVal16);
                    realmValStr.Close();
                    }
                basic.Close();
                realm.Close();
                }
            wwwAuth.Close();
hdr.Close();</codeblock></section>
</conbody></concept>