I am having the same issue.
On stackoverflow i found a similar issue which was resolved by up[grading werkzeug. (hopefully this helps for you too)
Unfortunately this didnt work for me and i am still stuck.
Noticed that it is for all images that have a "data-default-src"
<img class="oe_topbar_avatar" data-default-src="http://odoo.sapelli.pe/web/static/src/img/user_menu_avatar.png" src="http://odoo.sapelli.pe/web/image?model=res.users&field=image_small&id=1">
where actually the data-default-source is working, while the "src" isnt
below the same error but with the 9.0 install
mod_wsgi (pid=1998): Exception occurred processing WSGI script '/home/josesapelli/webapps/odoo/odoo/openerp-wsgi.py'.
Traceback (most recent call last):
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/odoo-9.0-py2.7.egg/openerp/service/wsgi_server.py", line 184, in application
return application_unproxied(environ, start_response)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/odoo-9.0-py2.7.egg/openerp/service/wsgi_server.py", line 170, in application_unproxied
result = handler(environ, start_response)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/odoo-9.0-py2.7.egg/openerp/http.py", line 1416, in __call__
return self.dispatch(environ, start_response)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/odoo-9.0-py2.7.egg/openerp/http.py", line 1390, in __call__
return self.app(environ, start_wrapped)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/werkzeug/wsgi.py", line 588, in __call__
return self.app(environ, start_response)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/odoo-9.0-py2.7.egg/openerp/http.py", line 1586, in dispatch
return response(environ, start_response)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/werkzeug/wrappers.py", line 1207, in __call__
start_response(status, headers)
File "/home/josesapelli/webapps/odoo/lib/python2.7/site-packages/odoo-9.0-py2.7.egg/openerp/http.py", line 1389, in start_wrapped
start_response(status, new_headers)
ValueError: no space following status code