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  1. #1
    Registered User
    Join Date
    Nov 2009
    Posts
    4

    Unhappy problem with Http response head

    my app uses the symtem http api to visit the http server.
    i used thereal to watch data transfer backgroud.i found that when it visit some url whose response has no 'Content-Type: '
    field,the response data packet as:

    Date:
    Mon, 02 Nov 2009
    09:58:12 GMT..S
    erver: Apache-Co
    yote/1.1..Set-Co
    okie: JSESSIONID
    =8A551D99488BAD3
    E12D24D5FDED6B24
    3; Path=/iread..
    Via: HTTP/1.1 mm
    xmp3 (XMS 724Sol
    utions HTG XMP_4
    0_M1_B069 200905
    15.122709)..Acce
    pt-Ranges: bytes
    ....

    but int the function MHFRunL(RHTTPTransaction aTransaction, const THTTPEvent &aEvent),
    the code

    RStringF contentType = iSession.StringPool().StringF(HTTP::EContentType, RHTTPSession::GetTable());
    THTTPHdrVal contentTypeValue;
    TBuf8<MAX_HTTP_HEAD_DATA_STR_LEN> tbContentType;
    if (responseHeaders.GetField(contentType, 0, contentTypeValue) == KErrNone)
    {
    const TDesC8& tdc8ContentType = contentTypeValue.StrF().DesC();
    tbContentType.Copy(tdc8ContentType);
    }

    this line: responseHeaders.GetField(contentType, 0, contentTypeValue) == KErrNone will be true,
    the value of tdc8ContentType is 'application/octet-stream'.

    it tells that if the http response head has no 'Content-Type: 'field,system will add
    'Content-Type: application/octet-stream' to it automatically.

    and use another function to deal with the RHTTPHeaders

    HBufC8* HttpCacheUtil::HeadersToBufferL(
    RHTTPHeaders& aHttpHeaders,
    RStringPool& aStrP )
    {
    // Get an iterator for the collection of response headers
    HBufC8* headerString = HBufC8::NewL( KMaxHeaderStrLen );
    TPtr8 headerPtr( headerString->Des() );
    TInt newLength( 0 );
    THTTPHdrFieldIter it = aHttpHeaders.Fields();

    while( it.AtEnd() == EFalse )
    {
    TPtrC8 rawData;
    // Get name of next header field
    RStringTokenF fieldName = it();
    RStringF fieldNameStr = aStrP.StringF( fieldName );
    aHttpHeaders.GetRawField( fieldNameStr, rawData );

    newLength+=( fieldNameStr.DesC().Length() + KHttpFieldSeparator().Length() + rawData.Length() +
    KHttpNewLine().Length() );

    if( headerPtr.MaxLength() < newLength )
    {
    // realloc
    HBufC8* temp = HBufC8::New( newLength + KMaxHeaderStrLen );
    if( !temp )
    {
    delete headerString;
    User::LeaveNoMemory();
    }
    temp->Des().Copy( headerPtr );
    delete headerString;
    headerString = temp;
    headerPtr.Set( headerString->Des() );
    }
    // append
    headerPtr.Append( fieldNameStr.DesC() );
    headerPtr.Append( KHttpFieldSeparator );
    headerPtr.Append( rawData );
    headerPtr.Append( KHttpNewLine );
    ++it;
    }
    //CleanupStack::PushL( headerString );
    return headerString;
    }

    headerString which is the returned String will has SubString 'Content-Type: application/octet-stream' also,
    In my app,the data whose MIME type is 'application/octet-stream' will call the download manager.
    but if there is no 'Content-Type: ' field int the http response head,the data will be dealt with as text.
    i wish when there isn't 'Content-Type: ' field int the http response head,the system won't add 'Content-Type: application/octet-stream'
    to it automatically,let the two function above can't get the 'Content-Type: ',give me some help,please.

  2. #2
    Nokia Developer Moderator
    Join Date
    Feb 2006
    Location
    Oslo, Norway
    Posts
    28,673

    Re: problem with Http response head

    It is the default behaviour suggested by the specs: http://www.w3.org/Protocols/rfc2616/....html#sec7.2.1

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