System.Net.Http: The format of value 'application/json; charset=utf-8' is invalid.

Repro steps

Provide the steps required to reproduce the problem

context.res = {
  headers : { "Content-Type" : "application/json; charset=utf-8" },
  body    : '{"foo":"bar"}',
  status  : 200
};
context.done();

Expected behavior

application/json; charset=utf-8 is a valid content-type header and there should be no error.

I have a valid JSON string and I would like to pass it directly with the content-type

Actual behavior

Error after function execution :

Exception while executing function: Functions.test. System.Net.Http: The format of value ‘application/json; charset=utf-8’ is invalid.

Known workarounds

Not setting content-typeand passing json as poco in body :

context.res = {
  headers : {},
  body    : { foo: "bar" },
  status  : 200
};
context.done();

Related information

• Programming language used : JavaScript with Node.js

[mathewc]

@yvele Agreed. I just fixed this in https://github.com/Azure/azure-webjobs-sdk-script/commit/fabcfc371add772f6791b30673e30f8578f7b287 and it will go out with our next release. Thanks.

[Clockwork-Muse]

For that matter, attempting to set the header to application/json; charset=utf-8 in the Java runner is yielding a 406 status (setting it to application/json seems to be overriden)