Quoted multipart boundary

[meztez]

webutils/R/get_boundary.R

Line 9 in 835953e

m <- regexpr('boundary=[^; ]{2,}', content_type, ignore.case = TRUE)

Per RFC2046

WARNING TO IMPLEMENTORS: The grammar for parameters on the Content-
type field is such that it is often necessary to enclose the boundary
parameter values in quotes on the Content-type line. This is not
always necessary, but never hurts. Implementors should be sure to
study the grammar carefully in order to avoid producing invalid
Content-type fields. Thus, a typical "multipart" Content-Type header
field might look like this:

 Content-Type: multipart/mixed; boundary=gc0p4Jq0M2Yt08j34c0p

But the following is not valid:

 Content-Type: multipart/mixed; boundary=gc0pJq0M:08jU534c0p

(because of the colon) and must instead be represented as

 Content-Type: multipart/mixed; boundary="gc0pJq0M:08jU534c0p"

This Content-Type value indicates that the content consists of one or
more parts, each with a structure that is syntactically identical to
an RFC 822 message, except that the header area is allowed to be
completely empty, and that the parts are each preceded by the line

ref rstudio/plumber#924

[jeroen]

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