59      * Checks if a certain header is present in this message. Header values are
62      * @param name the header name to check for.
63      * @return true if at least one header with this name is present.
68      * Returns all the headers with a specified name of this message. Header values
75     Header[] getHeaders(String name);  in getHeaders()
78      * Returns the first header with a specified name of this message. Header
79      * values are ignored. If there is more than one matching header in the
81      * If there is no matching header in the message <code>null</code> is 
84      * @param name the name of the header to return.
85      * @return the first header whose name property equals <code>name</code>
86      *   or <code>null</code> if no such header could be found.
88     Header getFirstHeader(String name);  in getFirstHeader()
91      * Returns the last header with a specified name of this message. Header values
92      * are ignored. If there is more than one matching header in the message the
94      * matching header in the message <code>null</code> is returned.
96      * @param name the name of the header to return.
97      * @return the last header whose name property equals <code>name</code>.
98      *   or <code>null</code> if no such header could be found.
100     Header getLastHeader(String name);  in getLastHeader()
108     Header[] getAllHeaders();  in getAllHeaders()
111      * Adds a header to this message. The header will be appended to the end of
114      * @param header the header to append.
116     void addHeader(Header header);  in addHeader()  argument
119      * Adds a header to this message. The header will be appended to the end of
122      * @param name the name of the header.
123      * @param value the value of the header.
128      * Overwrites the first header with the same name. The new header will be appended to 
129      * the end of the list, if no header with the given name can be found.
131      * @param header the header to set.
133     void setHeader(Header header);  in setHeader()  argument
136      * Overwrites the first header with the same name. The new header will be appended to 
137      * the end of the list, if no header with the given name can be found.
139      * @param name the name of the header.
140      * @param value the value of the header.
149     void setHeaders(Header[] headers);  in setHeaders()
152      * Removes a header from this message.
154      * @param header the header to remove.
156     void removeHeader(Header header);  in removeHeader()  argument
168      * @return Iterator that returns Header objects in the sequence they are
179      * @return Iterator that returns Header objects with the argument name