Changing headers for authorization changes Content Type

[crimson-med]

When I use Chain to send a request with a header. TheContent-Type is changes by GraphQL Zeus to a "utf-8"

This is with no header:

import { Chain, GraphQLTypes, InputType } from "../../zeus";

export const CreateSession = async (data: GraphQLTypes['SessionCreateInput'], token: string) => {
    try {
        const createSessionData = await Chain((process.env.REACT_APP_GRAPHQL as string), {
            // headers: {
            //     Authorization: token,
            // },
        })('mutation')({
            createSession: [
                { data },
                { id: true }
            ]
        });
        if (createSessionData.createSession) {
            return true
        }
        return undefined
    } catch (error) {
        return undefined
    }
};

Now if I uncomment and add the header the Content-Type changes:

import { Chain, GraphQLTypes, InputType } from "../../zeus";

export const CreateSession = async (data: GraphQLTypes['SessionCreateInput'], token: string) => {
    try {
        const createSessionData = await Chain((process.env.REACT_APP_GRAPHQL as string), {
            headers: {
                Authorization: token,
            },
        })('mutation')({
            createSession: [
                { data },
                { id: true }
            ]
        });
        if (createSessionData.createSession) {
            return true
        }
        return undefined
    } catch (error) {
        return undefined
    }
};

I have also tried adding the Content=Type as a proper header but this keeps it as text/plain

import { Chain, GraphQLTypes, InputType } from "../../zeus";

export const CreateSession = async (data: GraphQLTypes['SessionCreateInput'], token: string) => {
    try {
        const createSessionData = await Chain((process.env.REACT_APP_GRAPHQL as string), {
            headers: {
                Authorization: token,
                "Content-Type": "application/json"
            },
        })('mutation')({
            createSession: [
                { data },
                { id: true }
            ]
        });
        if (createSessionData.createSession) {
            return true
        }
        return undefined
    } catch (error) {
        return undefined
    }
};