# QHttpHeader Class Reference
## [[QtNetwork](index.htm) module]
该QHttpHeader类包含HTTP头信息。[More...](#details)
通过继承[QHttpRequestHeader](qhttprequestheader.html)和[QHttpResponseHeader](qhttpresponseheader.html)。
### Methods
* `__init__ (self)`
* `__init__ (self, QHttpHeader header)`
* `__init__ (self, QString str)`
* `addValue (self, QString key, QString value)`
* `QStringList allValues (self, QString key)`
* `int contentLength (self)`
* `QString contentType (self)`
* `bool hasContentLength (self)`
* `bool hasContentType (self)`
* `bool hasKey (self, QString key)`
* `bool isValid (self)`
* `QStringList keys (self)`
* `int majorVersion (self)`
* `int minorVersion (self)`
* `bool parse (self, QString str)`
* `bool parseLine (self, QString line, int number)`
* `removeAllValues (self, QString key)`
* `removeValue (self, QString key)`
* `setContentLength (self, int len)`
* `setContentType (self, QString type)`
* `setValid (self, bool)`
* `setValue (self, QString key, QString value)`
* `setValues (self, list-of-tuple-of-QString-QString values)`
* `QString toString (self)`
* `QString value (self, QString key)`
* `list-of-tuple-of-QString-QString values (self)`
* * *
## Detailed Description
该QHttpHeader类包含HTTP头信息。
在大多数情况下，你应该使用这个类的更专业的衍生物，[QHttpResponseHeader](qhttpresponseheader.html)和[QHttpRequestHeader](qhttprequestheader.html)，而不是直接使用QHttpHeader 。
QHttpHeader提供的HTTP标头字段。 HTTP头域由一个名称，后跟一个冒号，一个空格，和字段值。 （参见RFC 1945 ）。字段名不区分大小写。一个典型的标头栏位看起来像这样：
```
content-type: text/html
```
在API的报头字段的名称被称为“键”和内容被称为“价值” 。您可以获取和设置一个报头字段的值，用其与关键[value](qhttpheader.html#value)（）和[setValue](qhttpheader.html#setValue)（ ），例如
```
header.setValue("content-type", "text/html");
[QString](qstring.html) contentType = header.value("content-type");
```
有些领域是如此普遍， getter和setter方法是为他们提供一个方便的替代品使用[value](qhttpheader.html#value)（）和[setValue](qhttpheader.html#setValue)（ ），例如[contentLength](qhttpheader.html#contentLength)（）和[contentType](qhttpheader.html#contentType)（ ）[setContentLength](qhttpheader.html#setContentLength)（）和[setContentType](qhttpheader.html#setContentType)（ ） 。
每头键都有一个_single_与它相关联的值。如果设置的值已经存在一个关键的前一个值将被丢弃。
* * *
## Method Documentation
```
QHttpHeader.__init__ (self)
```
构造一个空的HTTP标头。
```
QHttpHeader.__init__ (self, QHttpHeader header)
```
构造的副本_header_。
```
QHttpHeader.__init__ (self, QString str)
```
构造一个HTTP头的_str_。
这个构造函数解析字符串_str_为报头字段，并添加该信息。该_str_应该由一个或多个的“ \ r \ n ”分隔行;这些线路的格式应为关键，冒号，空格，值。
```
QHttpHeader.addValue (self, QString key, QString value)
```
添加一个新条目与_key_和_value_。
```
QStringList QHttpHeader.allValues (self, QString key)
```
返回与给定的所有条目_key_。如果没有条目有这_key_，则返回一个空字符串列表。
```
int QHttpHeader.contentLength (self)
```
返回特殊的HTTP标头字段的值`content-length`。
**See also** [setContentLength](qhttpheader.html#setContentLength)（）和[hasContentLength](qhttpheader.html#hasContentLength)（ ） 。
```
QString QHttpHeader.contentType (self)
```
返回特殊的HTTP标头字段的值`content-type`。
**See also** [setContentType](qhttpheader.html#setContentType)（）和[hasContentType](qhttpheader.html#hasContentType)（ ） 。
```
bool QHttpHeader.hasContentLength (self)
```
如果头具有特殊的HTTP标头字段中的条目，则返回True`content-length`否则返回False 。
**See also** [contentLength](qhttpheader.html#contentLength)（）和[setContentLength](qhttpheader.html#setContentLength)（ ） 。
```
bool QHttpHeader.hasContentType (self)
```
如果头具有特殊的HTTP标头字段中的条目，则返回True`content-type`否则返回False 。
**See also** [contentType](qhttpheader.html#contentType)（）和[setContentType](qhttpheader.html#setContentType)（ ） 。
```
bool QHttpHeader.hasKey (self, QString key)
```
如果HTTP头有一个给定的条目，则返回True_key_否则返回False 。
**See also** [value](qhttpheader.html#value)（ ）[setValue](qhttpheader.html#setValue)（）和[keys](qhttpheader.html#keys)（ ） 。
```
bool QHttpHeader.isValid (self)
```
返回True如果HTTP头是有效的，否则返回False 。
A [QHttpHeader](qhttpheader.html)是无效的，如果它是通过解析一个格式错误的字符串创建的。
```
QStringList QHttpHeader.keys (self)
```
返回在HTTP报头中的键的列表。
**See also** [hasKey](qhttpheader.html#hasKey)（ ） 。
```
int QHttpHeader.majorVersion (self)
```
这种方法是抽象的，应在任何子类中重新实现。
返回主协议版本的HTTP标头。
```
int QHttpHeader.minorVersion (self)
```
这种方法是抽象的，应在任何子类中重新实现。
返回未成年协议版本的HTTP标头。
```
bool QHttpHeader.parse (self, QString str)
```
```
bool QHttpHeader.parseLine (self, QString line, int number)
```
```
QHttpHeader.removeAllValues (self, QString key)
```
删除与该键中的所有条目_key_从HTTP标头。
```
QHttpHeader.removeValue (self, QString key)
```
删除与该键的条目_key_从HTTP标头。
**See also** [value](qhttpheader.html#value)（）和[setValue](qhttpheader.html#setValue)（ ） 。
```
QHttpHeader.setContentLength (self, int len)
```
设置特殊的HTTP标头字段的值`content-length`至_len_。
**See also** [contentLength](qhttpheader.html#contentLength)（）和[hasContentLength](qhttpheader.html#hasContentLength)（ ） 。
```
QHttpHeader.setContentType (self, QString type)
```
设置特殊的HTTP标头字段的值`content-type`至_type_。
**See also** [contentType](qhttpheader.html#contentType)（）和[hasContentType](qhttpheader.html#hasContentType)（ ） 。
```
QHttpHeader.setValid (self, bool)
```
```
QHttpHeader.setValue (self, QString key, QString value)
```
设置与该项目的值_key_至_value_。
如果没有条目_key_存在，一个新的项与给定_key_和_value_被创建。如果与一个条目_key_已经存在，则第一个值将被丢弃并用给定的替换_value_。
**See also** [value](qhttpheader.html#value)（ ）[hasKey](qhttpheader.html#hasKey)（）和[removeValue](qhttpheader.html#removeValue)（ ） 。
```
QHttpHeader.setValues (self, list-of-tuple-of-QString-QString values)
```
套头项是在键值对列表_values_。
**See also** [values](qhttpheader.html#values)（ ） 。
```
QString QHttpHeader.toString (self)
```
返回的HTTP标头的字符串表示形式。
该字符串是适合于采用一个构造函数使用[QString](qstring.html)。它是由线的格式：关键，冒号，空格，值， “ \ r \ N” 。
```
QString QHttpHeader.value (self, QString key)
```
返回与给定条目中的第一个值_key_。如果没有条目有这_key_，则返回一个空字符串。
**See also** [setValue](qhttpheader.html#setValue)（ ）[removeValue](qhttpheader.html#removeValue)（ ）[hasKey](qhttpheader.html#hasKey)（）和[keys](qhttpheader.html#keys)（ ） 。
```
list-of-tuple-of-QString-QString QHttpHeader.values (self)
```
返回头中的所有条目。
**See also** [setValues](qhttpheader.html#setValues)（ ） 。
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- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference