HttpUtil (Netty API Reference (4.1.115.Final))

java.lang.Object
- io.netty.handler.codec.http.HttpUtil

public final class HttpUtil
extends Object

Utility methods useful in the HTTP context.

Method Summary

All Methods Static Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`static String`	`formatHostnameForHttp(InetSocketAddress addr)` Formats the host string of an address so it can be used for computing an HTTP component such as a URL or a Host header
`static Charset`	`getCharset(CharSequence contentTypeValue)` Fetch charset from Content-Type header value.
`static Charset`	`getCharset(CharSequence contentTypeValue, Charset defaultCharset)` Fetch charset from Content-Type header value.
`static Charset`	`getCharset(HttpMessage message)` Fetch charset from message's Content-Type header.
`static Charset`	`getCharset(HttpMessage message, Charset defaultCharset)` Fetch charset from message's Content-Type header.
`static CharSequence`	`getCharsetAsSequence(CharSequence contentTypeValue)` Fetch charset from Content-Type header value as a char sequence.
`static CharSequence`	`getCharsetAsSequence(HttpMessage message)` Fetch charset from message's Content-Type header as a char sequence.
`static CharSequence`	`getCharsetAsString(HttpMessage message)` Deprecated. use `getCharsetAsSequence(HttpMessage)`
`static long`	`getContentLength(HttpMessage message)` Returns the length of the content.
`static int`	`getContentLength(HttpMessage message, int defaultValue)` Get an `int` representation of `getContentLength(HttpMessage, long)`.
`static long`	`getContentLength(HttpMessage message, long defaultValue)` Returns the length of the content or the specified default value if the message does not have the `"Content-Length" header`.
`static CharSequence`	`getMimeType(CharSequence contentTypeValue)` Fetch MIME type part from Content-Type header value as a char sequence.
`static CharSequence`	`getMimeType(HttpMessage message)` Fetch MIME type part from message's Content-Type header as a char sequence.
`static boolean`	`is100ContinueExpected(HttpMessage message)` Returns `true` if and only if the specified message contains an expect header and the only expectation present is the 100-continue expectation.
`static boolean`	`isAsteriskForm(String uri)` Determine if a string uri is in asterisk-form according to rfc7230, 5.3.
`static boolean`	`isAsteriskForm(URI uri)` Determine if a uri is in asterisk-form according to rfc7230, 5.3.
`static boolean`	`isContentLengthSet(HttpMessage m)`
`static boolean`	`isKeepAlive(HttpMessage message)` Returns `true` if and only if the connection can remain open and thus 'kept alive'.
`static boolean`	`isOriginForm(String uri)` Determine if a string uri is in origin-form according to rfc7230, 5.3.
`static boolean`	`isOriginForm(URI uri)` Determine if a uri is in origin-form according to rfc7230, 5.3.
`static boolean`	`isTransferEncodingChunked(HttpMessage message)` Checks to see if the transfer encoding in a specified `HttpMessage` is chunked
`static long`	`normalizeAndGetContentLength(List<? extends CharSequence> contentLengthFields, boolean isHttp10OrEarlier, boolean allowDuplicateContentLengths)` Validates, and optionally extracts the content length from headers.
`static void`	`set100ContinueExpected(HttpMessage message, boolean expected)` Sets or removes the `"Expect: 100-continue"` header to / from the specified message.
`static void`	`setContentLength(HttpMessage message, long length)` Sets the `"Content-Length"` header.
`static void`	`setKeepAlive(HttpHeaders h, HttpVersion httpVersion, boolean keepAlive)` Sets the value of the `"Connection"` header depending on the protocol version of the specified message.
`static void`	`setKeepAlive(HttpMessage message, boolean keepAlive)` Sets the value of the `"Connection"` header depending on the protocol version of the specified message.
`static void`	`setTransferEncodingChunked(HttpMessage m, boolean chunked)` Set the `HttpHeaderNames.TRANSFER_ENCODING` to either include `HttpHeaderValues.CHUNKED` if `chunked` is `true`, or remove `HttpHeaderValues.CHUNKED` if `chunked` is `false`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - isOriginForm
```
public static boolean isOriginForm(URI uri)
```
    Determine if a uri is in origin-form according to rfc7230, 5.3.
  - isOriginForm
```
public static boolean isOriginForm(String uri)
```
    Determine if a string uri is in origin-form according to rfc7230, 5.3.
  - isAsteriskForm
```
public static boolean isAsteriskForm(URI uri)
```
    Determine if a uri is in asterisk-form according to rfc7230, 5.3.
  - isAsteriskForm
```
public static boolean isAsteriskForm(String uri)
```
    Determine if a string uri is in asterisk-form according to rfc7230, 5.3.
  - isKeepAlive
```
public static boolean isKeepAlive(HttpMessage message)
```
    Returns true if and only if the connection can remain open and thus 'kept alive'. This methods respects the value of the. "Connection" header first and then the return value of HttpVersion.isKeepAliveDefault().
  - setKeepAlive
```
public static void setKeepAlive(HttpMessage message,
                                boolean keepAlive)
```
    Sets the value of the "Connection" header depending on the protocol version of the specified message. This getMethod sets or removes the "Connection" header depending on what the default keep alive mode of the message's protocol version is, as specified by HttpVersion.isKeepAliveDefault().
    - If the connection is kept alive by default:
      
      set to "close" if keepAlive is false.
      
      remove otherwise.
    - If the connection is closed by default:
      
      set to "keep-alive" if keepAlive is true.
      
      remove otherwise.
    See Also:
    
    setKeepAlive(HttpHeaders, HttpVersion, boolean)
  - setKeepAlive
```
public static void setKeepAlive(HttpHeaders h,
                                HttpVersion httpVersion,
                                boolean keepAlive)
```
    Sets the value of the "Connection" header depending on the protocol version of the specified message. This getMethod sets or removes the "Connection" header depending on what the default keep alive mode of the message's protocol version is, as specified by HttpVersion.isKeepAliveDefault().
    - If the connection is kept alive by default:
      
      set to "close" if keepAlive is false.
      
      remove otherwise.
    - If the connection is closed by default:
      
      set to "keep-alive" if keepAlive is true.
      
      remove otherwise.
  - getContentLength
```
public static long getContentLength(HttpMessage message)
```
    Returns the length of the content. Please note that this value is not retrieved from ByteBufHolder.content() but from the "Content-Length" header, and thus they are independent from each other.
    
    Returns:
    
    the content length
    
    Throws:
    
    NumberFormatException - if the message does not have the "Content-Length" header or its value is not a number
  - getContentLength
```
public static long getContentLength(HttpMessage message,
                                    long defaultValue)
```
    Returns the length of the content or the specified default value if the message does not have the "Content-Length" header. Please note that this value is not retrieved from ByteBufHolder.content() but from the "Content-Length" header, and thus they are independent from each other.
    
    Parameters:
    
    message - the message
    
    defaultValue - the default value
    
    Returns:
    
    the content length or the specified default value
    
    Throws:
    
    NumberFormatException - if the "Content-Length" header does not parse as a long
  - getContentLength
```
public static int getContentLength(HttpMessage message,
                                   int defaultValue)
```
    Get an int representation of getContentLength(HttpMessage, long).
    
    Returns:
    
    the content length or defaultValue if this message does not have the "Content-Length" header.
    
    Throws:
    
    NumberFormatException - if the "Content-Length" header does not parse as an int
  - setContentLength
```
public static void setContentLength(HttpMessage message,
                                    long length)
```
    Sets the "Content-Length" header.
  - isContentLengthSet
```
public static boolean isContentLengthSet(HttpMessage m)
```
  - is100ContinueExpected
```
public static boolean is100ContinueExpected(HttpMessage message)
```
    Returns true if and only if the specified message contains an expect header and the only expectation present is the 100-continue expectation. Note that this method returns false if the expect header is not valid for the message (e.g., the message is a response, or the version on the message is HTTP/1.0).
    
    Parameters:
    
    message - the message
    
    Returns:
    
    true if and only if the expectation 100-continue is present and it is the only expectation present
  - set100ContinueExpected
```
public static void set100ContinueExpected(HttpMessage message,
                                          boolean expected)
```
    Sets or removes the "Expect: 100-continue" header to / from the specified message. If expected is true, the "Expect: 100-continue" header is set and all other previous "Expect" headers are removed. Otherwise, all "Expect" headers are removed completely.
  - isTransferEncodingChunked
```
public static boolean isTransferEncodingChunked(HttpMessage message)
```
    Checks to see if the transfer encoding in a specified HttpMessage is chunked
    
    Parameters:
    
    message - The message to check
    
    Returns:
    
    True if transfer encoding is chunked, otherwise false
  - setTransferEncodingChunked
```
public static void setTransferEncodingChunked(HttpMessage m,
                                              boolean chunked)
```
    Set the HttpHeaderNames.TRANSFER_ENCODING to either include HttpHeaderValues.CHUNKED if chunked is true, or remove HttpHeaderValues.CHUNKED if chunked is false.
    
    Parameters:
    
    m - The message which contains the headers to modify.
    
    chunked - if true then include HttpHeaderValues.CHUNKED in the headers. otherwise remove HttpHeaderValues.CHUNKED from the headers.
  - getCharset
```
public static Charset getCharset(HttpMessage message)
```
    Fetch charset from message's Content-Type header.
    
    Parameters:
    
    message - entity to fetch Content-Type header from
    
    Returns:
    
    the charset from message's Content-Type header or CharsetUtil.ISO_8859_1 if charset is not presented or unparsable
  - getCharset
```
public static Charset getCharset(CharSequence contentTypeValue)
```
    Fetch charset from Content-Type header value.
    
    Parameters:
    
    contentTypeValue - Content-Type header value to parse
    
    Returns:
    
    the charset from message's Content-Type header or CharsetUtil.ISO_8859_1 if charset is not presented or unparsable
  - getCharset
```
public static Charset getCharset(HttpMessage message,
                                 Charset defaultCharset)
```
    Fetch charset from message's Content-Type header.
    
    Parameters:
    
    message - entity to fetch Content-Type header from
    
    defaultCharset - result to use in case of empty, incorrect or doesn't contain required part header value
    
    Returns:
    
    the charset from message's Content-Type header or defaultCharset if charset is not presented or unparsable
  - getCharset
```
public static Charset getCharset(CharSequence contentTypeValue,
                                 Charset defaultCharset)
```
    Fetch charset from Content-Type header value.
    
    Parameters:
    
    contentTypeValue - Content-Type header value to parse
    
    defaultCharset - result to use in case of empty, incorrect or doesn't contain required part header value
    
    Returns:
    
    the charset from message's Content-Type header or defaultCharset if charset is not presented or unparsable
  - getCharsetAsString
```
@Deprecated
public static CharSequence getCharsetAsString(HttpMessage message)
```
    Deprecated. use getCharsetAsSequence(HttpMessage)
    
    Fetch charset from message's Content-Type header as a char sequence. A lot of sites/possibly clients have charset="CHARSET", for example charset="utf-8". Or "utf8" instead of "utf-8" This is not according to standard, but this method provide an ability to catch desired mistakes manually in code
    
    Parameters:
    
    message - entity to fetch Content-Type header from
    
    Returns:
    
    the CharSequence with charset from message's Content-Type header or null if charset is not presented
  - getCharsetAsSequence
```
public static CharSequence getCharsetAsSequence(HttpMessage message)
```
    Fetch charset from message's Content-Type header as a char sequence. A lot of sites/possibly clients have charset="CHARSET", for example charset="utf-8". Or "utf8" instead of "utf-8" This is not according to standard, but this method provide an ability to catch desired mistakes manually in code
    
    Returns:
    
    the CharSequence with charset from message's Content-Type header or null if charset is not presented
  - getCharsetAsSequence
```
public static CharSequence getCharsetAsSequence(CharSequence contentTypeValue)
```
    Fetch charset from Content-Type header value as a char sequence. A lot of sites/possibly clients have charset="CHARSET", for example charset="utf-8". Or "utf8" instead of "utf-8" This is not according to standard, but this method provide an ability to catch desired mistakes manually in code
    
    Parameters:
    
    contentTypeValue - Content-Type header value to parse
    
    Returns:
    
    the CharSequence with charset from message's Content-Type header or null if charset is not presented
    
    Throws:
    
    NullPointerException - in case if contentTypeValue == null
  - getMimeType
```
public static CharSequence getMimeType(HttpMessage message)
```
    Fetch MIME type part from message's Content-Type header as a char sequence.
    
    Parameters:
    
    message - entity to fetch Content-Type header from
    
    Returns:
    
    the MIME type as a CharSequence from message's Content-Type header or null if content-type header or MIME type part of this header are not presented
    "content-type: text/html; charset=utf-8" - "text/html" will be returned
    "content-type: text/html" - "text/html" will be returned
    "content-type: " or no header - null we be returned
  - getMimeType
```
public static CharSequence getMimeType(CharSequence contentTypeValue)
```
    Fetch MIME type part from Content-Type header value as a char sequence.
    
    Parameters:
    
    contentTypeValue - Content-Type header value to parse
    
    Returns:
    
    the MIME type as a CharSequence from message's Content-Type header or null if content-type header or MIME type part of this header are not presented
    "content-type: text/html; charset=utf-8" - "text/html" will be returned
    "content-type: text/html" - "text/html" will be returned
    "content-type: empty header - null we be returned
    
    Throws:
    
    NullPointerException - in case if contentTypeValue == null
  - formatHostnameForHttp
```
public static String formatHostnameForHttp(InetSocketAddress addr)
```
    Formats the host string of an address so it can be used for computing an HTTP component such as a URL or a Host header
    
    Parameters:
    
    addr - the address
    
    Returns:
    
    the formatted String
  - normalizeAndGetContentLength
```
public static long normalizeAndGetContentLength(List<? extends CharSequence> contentLengthFields,
                                                boolean isHttp10OrEarlier,
                                                boolean allowDuplicateContentLengths)
```
    Validates, and optionally extracts the content length from headers. This method is not intended for general use, but is here to be shared between HTTP/1 and HTTP/2 parsing.
    
    Parameters:
    
    contentLengthFields - the content-length header fields.
    
    isHttp10OrEarlier - true if we are handling HTTP/1.0 or earlier
    
    allowDuplicateContentLengths - true if multiple, identical-value content lengths should be allowed.
    
    Returns:
    
    the normalized content length from the headers or -1 if the fields were empty.
    
    Throws:
    
    IllegalArgumentException - if the content-length fields are not valid

Class HttpUtil

Method Summary

Methods inherited from class java.lang.Object

Method Detail

isOriginForm

isOriginForm

isAsteriskForm

isAsteriskForm

isKeepAlive

setKeepAlive

setKeepAlive

getContentLength

getContentLength

getContentLength

setContentLength

isContentLengthSet

is100ContinueExpected

set100ContinueExpected

isTransferEncodingChunked

setTransferEncodingChunked

getCharset

getCharset

getCharset

getCharset

getCharsetAsString

getCharsetAsSequence

getCharsetAsSequence

getMimeType

getMimeType

formatHostnameForHttp

normalizeAndGetContentLength