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