[finishes #95926382] Read entire asset upload before rejecting it with 415 Unsupported Media Type, otherwise Varnish may return 503 instead of 415 and we'll show the wrong error in the UI.
[finishes #95926382] Read entire asset upload before rejecting it with 415 Unsupported Media Type, otherwise Varnish may return 503 instead of 415 and we'll show the wrong error in the UI.

rvarshney/code-dot-org,pickettd/code-dot-org,pickettd/code-dot-org,rvarshney/code-dot-org,ty-po/code-dot-org,rvarshney/code-dot-org,ty-po/code-dot-org,ty-po/code-dot-org,ty-po/code-dot-org,pickettd/code-dot-org,ty-po/code-dot-org,dillia23/code-dot-org,rvarshney/code-dot-org,dillia23/code-dot-org,dillia23/code-dot-org,pickettd/code-dot-org,pickettd/code-dot-org,ty-po/code-dot-org,pickettd/code-dot-org,rvarshney/code-dot-org,pickettd/code-dot-org,dillia23/code-dot-org,ty-po/code-dot-org,dillia23/code-dot-org,ty-po/code-dot-org,rvarshney/code-dot-org,dillia23/code-dot-org,dillia23/code-dot-org,rvarshney/code-dot-org,dillia23/code-dot-org,pickettd/code-dot-org,rvarshney/code-dot-org