Alternative to PaceMinimalSlug that uses an HTTP header instead (therefore, it works for media posts as well as entry posts).
Same rationale as PaceMinimalSlug: "Many existing weblog software implementations allow clients to request specific URI content entries. APP should also support this capability"
8.5 Segment: Header When posting a resource to a collection in order to add a new member, a client can include a Segment request header. This constitutes a request by the client that the URI assigned to the new resource incorporate the string provided in the value of the Segment header. Server implementations MAY ignore the Segment header. For example, POST /myblog/fotes HTTP/1.1 Host: example.org Content- Type: image/png Content- Length: nnnn Segment: a_picture_of_my_house ...binary data... The syntax of this header MUST conform to the augmented BNF grammar in section 2.1 of the HTTP/1.1 specification [RFC2616]. The [TEXT] rule is described in section 2.2 of the same document. Words of *TEXT MAY contain characters from character sets other than [ISO88591] only when encoded according to the rules of [RFC2047]. Server implementations are more likely to be able to incorporate requested strings if they are constructed with sensitivity to URI syntax rules [RFC3986]. In particular, strings containing characters with syntactic significance, in particular the path-separator character "/", are apt to cause server implementations difficulty.