Allow override to arbitrary Content-Type

README.md

@@ -27,4 +27,5 @@ URL=https://idp.example.com/idp/profile/SAML2/SOAP/ECP \
 bash test.sh | xmllint --pretty 1 -
 ```
 
-
+You can also override the HTTP `Content-Type` in the request by setting
+`CONTENT_TYPE` environment variables.

test.sh

@@ -24,6 +24,6 @@ echo $REQUEST | xmllint --pretty 1 -
 echo $REQUEST |
 	curl -k \
 		-d @- \
-		-H "Content-Type: text/xml" \
+		-H "Content-Type: ${CONTENT_TYPE:-text/xml}" \
 		--basic -u $CRED \
 		$URL