empty header values in responses are breaking the application since version 2.10.1

[BigMichi1]

• [ x ] I was not able to find an open or closed issue matching what I'm seeing.
• [ x ] This is not a question. (Questions should be asked on chat (Signup here) or our forums.)

Provide a narrative description of what you are trying to accomplish.

Code to reproduce the issue

since the update from version 2.10.0 to 2.10.1 (only this package changed) i receive this error Zend\Diactoros\Exception\InvalidArgumentException: Invalid header value type; must be a string or numeric; received NULL when i'm using the geocoder module. i tracked it down to this request that is sent: https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer/find?text=Alexanderplatz%2C+Berlin&sourceCountry=DEU&maxLocations=1&f=json&outFields=*

in the response the header field for Server is empty, see:

Expected results

should not fail on empty header values, like it was in version 2.10.0

Actual results

request are failing because of the response contains an empty header value

[michalbundyra]

@BigMichi1 Thanks for reporting. I would need more details. Exception from Diactoros is not helpful, as zend-http doesn't have that dependency and it must be somewhere in your project.

[weierophinney]

@BigMichi1 Are you using zend-psr7bridge by any chance?

[BigMichi1]

i'm using also
zendframework/zend-psr7bridge 1.2.0 PSR-7 <-> zend-http message conversions
thats right, the issue is before updating zend-http to 2.10.1 it works with version 2.10.0

[michalbundyra]

@BigMichi1 Version 2.11.1 with the hotfix has been released. Thanks for reporting the issue!