WARC Content-Type may need to have a space but it shouldn't

[chfoo]

In regard to internetarchive/CDX-Writer#4,

application/http;msgtype=request and application/http;msgtype=response may need to have a space after the semicolon (application/http; msgtype=response) for de facto compatibility.

Wpull currently uses no space in the same fashion of Wget.

WARC ISO 28500 draft spec Annex C examples also omits the space.

Cursory searches reveal writers seem to omit the space:

• arc2warc.py
• http.rb
• warcrecords.py

Unfortunately, it seems like there's fixed string comparison syndrome for readers:

• HeritrixWrapper.java
• cdxreader.py

[chfoo]

Fixed in internetarchive/CDX-Writer. No changes to Wpull will be made.