Michael Osipov created HTTPCLIENT-2064:
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             Summary: MultipartEntityBuilder should support preamble and epilog
                 Key: HTTPCLIENT-2064
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2064
             Project: HttpComponents HttpClient
          Issue Type: Improvement
          Components: HttpClient (classic)
    Affects Versions: 5.0
            Reporter: Michael Osipov


According to RFC 2046, section 5.1.1 one can augment the multipart message with 
a preamble and an epilog. Both may consist of:
 
{noformat}
     multipart-body := [preamble CRLF]
                       dash-boundary transport-padding CRLF
                       body-part *encapsulation
                       close-delimiter transport-padding
                       [CRLF epilogue]
     preamble := discard-text
     epilogue := discard-text
     discard-text := *(*text CRLF) *text
                     ; May be ignored or discarded.
{noformat}

{{text}} is defined in RFC 822, section 3.3 as:

{noformat}
    text =  <any CHAR, including bare   ; => atoms, specials,
            CR & bare LF, but NOT       ;  comments and
            including CRLF>             ;  quoted-strings are
                                        ;  NOT recognized.
{noformat}

{{CHAR}} is 0 to 127.

This could be added as

{code}
MultipartEntityBuilder#addPreamble()
MultipartEntityBuilder#addEpilog()
{code}



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