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# TQHttpHeader Class Reference
[network module]

The TQHttpHeader class contains header information for HTTP. More...

`#include <ntqhttp.h>`

Inherited by TQHttpResponseHeader and TQHttpRequestHeader.

List of all member functions.

## Public Members

- TQHttpHeader ()
- TQHttpHeader ( const TQHttpHeader & header )
- TQHttpHeader ( const TQString & str )
- virtual ~TQHttpHeader ()
- TQHttpHeader & operator= ( const TQHttpHeader & h )
- TQString value ( const TQString & key ) const
- void setValue ( const TQString & key, const TQString & value )
- void removeValue ( const TQString & key )
- TQStringList keys () const
- bool hasKey ( const TQString & key ) const
- bool hasContentLength () const
- uint contentLength () const
- void setContentLength ( int len )
- bool hasContentType () const
- TQString contentType () const
- void setContentType ( const TQString & type )
- virtual TQString toString () const
- bool isValid () const
- virtual int majorVersion () const = 0
- virtual int minorVersion () const = 0

## Detailed Description

The TQHttpHeader class contains header information for HTTP.

In most cases you should use the more specialized derivatives of this class, TQHttpResponseHeader and TQHttpRequestHeader, rather than directly using TQHttpHeader.

TQHttpHeader provides the HTTP header fields. A HTTP header field consists of a name followed by a colon, a single space, and the field value. (See RFC 1945.) Field names are case-insensitive. A typical header field looks like this:

        content-type: text/html

In the API the header field name is called the "key" and the content is called the "value". You can get and set a header field's value by using its key with value() and setValue(), e.g.

        header.setValue( "content-type", "text/html" );
        TQString contentType = header.value( "content-type" );

Some fields are so common that getters and setters are provided for them as a convenient alternative to using value() and setValue(), e.g. contentLength() and contentType(), setContentLength() and setContentType().

Each header key has a single value associated with it. If you set the value for a key which already exists the previous value will be discarded.

See also TQHttpRequestHeader, TQHttpResponseHeader, and Input/Output and Networking.

## Member Function Documentation

### TQHttpHeader::TQHttpHeader ()

Constructs an empty HTTP header.

### TQHttpHeader::TQHttpHeader ( const TQHttpHeader & header )

Constructs a copy of header.

### TQHttpHeader::TQHttpHeader ( const TQString & str )

Constructs a HTTP header for str.

This constructor parses the string str for header fields and adds this information. The str should consist of one or more "\r\n" delimited lines; each of these lines should have the format key, colon, space, value.

### TQHttpHeader::~TQHttpHeader ()`[virtual]`

Destructor.

### uint TQHttpHeader::contentLength () const

Returns the value of the special HTTP header field `content-length`.

See also setContentLength() and hasContentLength().

### TQString TQHttpHeader::contentType () const

Returns the value of the special HTTP header field `content-type`.

See also setContentType() and hasContentType().

### bool TQHttpHeader::hasContentLength () const

Returns TRUE if the header has an entry for the special HTTP header field `content-length`; otherwise returns FALSE.

See also contentLength() and setContentLength().

### bool TQHttpHeader::hasContentType () const

Returns TRUE if the header has an entry for the the special HTTP header field `content-type`; otherwise returns FALSE.

See also contentType() and setContentType().

### bool TQHttpHeader::hasKey ( const TQString & key ) const

Returns TRUE if the HTTP header has an entry with the given key; otherwise returns FALSE.

See also value(), setValue(), and keys().

### bool TQHttpHeader::isValid () const

Returns TRUE if the HTTP header is valid; otherwise returns FALSE.

A TQHttpHeader is invalid if it was created by parsing a malformed string.

### TQStringList TQHttpHeader::keys () const

Returns a list of the keys in the HTTP header.

See also hasKey().

### int TQHttpHeader::majorVersion () const`[pure virtual]`

Returns the major protocol-version of the HTTP header.

Reimplemented in TQHttpResponseHeader and TQHttpRequestHeader.

### int TQHttpHeader::minorVersion () const`[pure virtual]`

Returns the minor protocol-version of the HTTP header.

Reimplemented in TQHttpResponseHeader and TQHttpRequestHeader.

### TQHttpHeader & TQHttpHeader::operator= ( const TQHttpHeader & h )

Assigns h and returns a reference to this http header.

### void TQHttpHeader::removeValue ( const TQString & key )

Removes the entry with the key key from the HTTP header.

See also value() and setValue().

### void TQHttpHeader::setContentLength ( int len )

Sets the value of the special HTTP header field `content-length` to len.

See also contentLength() and hasContentLength().

### void TQHttpHeader::setContentType ( const TQString & type )

Sets the value of the special HTTP header field `content-type` to type.

See also contentType() and hasContentType().

Example: network/archivesearch/archivedialog.ui.h.

### void TQHttpHeader::setValue ( const TQString & key, const TQString & value )

Sets the value of the entry with the key to value.

If no entry with key exists, a new entry with the given key and value is created. If an entry with the key already exists, its value is discarded and replaced with the given value.

See also value(), hasKey(), and removeValue().

Example: network/archivesearch/archivedialog.ui.h.

### TQString TQHttpHeader::toString () const`[virtual]`

Returns a string representation of the HTTP header.

The string is suitable for use by the constructor that takes a TQString. It consists of lines with the format: key, colon, space, value, "\r\n".

### TQString TQHttpHeader::value ( const TQString & key ) const

Returns the value for the entry with the given key. If no entry has this key, an empty string is returned.

See also setValue(), removeValue(), hasKey(), and keys().

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