is-mime-content-type

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is-mime-content-type

Matches the "Content-Type" header of the stream to custom-defined accept rules. Returns true if the "Content-Type" header exists and the rules match its value, otherwise returns false. A stream without "Content-Type" header will be treated as "application/octet-stream".

 

The accept rules have the following format, in extended Backus-Naur form (EBNF) notation:

 

Match ::= Single ("," Single)*

Single ::= Spaces? Type-Match ( Spaces? ";" Spaces? Parameter )* Spaces?

Type-Match ::= 

    "*/*" |

    Type "/*" |

    Type "/*+" Suffix |

    Type "/" Subtype

 

Parameter ::= Name "=" Value

 

Signature

is-mime-content-type(s:stream, accept:string) -> Boolean

 

Parameters

Name

Type

Description

s

stream

Specifies the input stream.

accept

string

Specifies the custom-defined accept rules.

 

Examples

The following expression will return true if stream msg contains the header Content-Type: text/html; charset=utf-8 or Content-Type: text/plain; charset=utf-8.

 

is-mime-content-type(msg, "text/*; charset=\"utf-8\"")

 

The following expression will return true if stream msg contains the header Content-Type: application/rss+xml or Content-Type: application/svg+xml.

 

is-mime-content-type(msg, "application/*+xml")

 

You can also match multiple rules by separating them with a comma. For example, the following expression will return true if stream msg contains the header Content-Type: text/xml or Content-Type: application/xml:

 

is-mime-content-type(msg, "text/xml, application/xml")


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