Azure Function call

var functionUrl : string = "https://[functionName].azurewebsites.net/api/[FunctionMethod]?code=[codeValue]"
    
const requestHeaders: Headers = new Headers();
requestHeaders.append("Content-type", "application/json");
requestHeaders.append("Cache-Control", "no-cache"); 

const postOptions : RequestInit = {
headers: requestHeaders,
body: `{\r\n    siteURL: '${siteUrl}',\r\n    pageName: '${pageName}' \r\n}`,
method: "POST"
};

let responseText: string = "";
let createPageStatus: string = "";
console.log("Wait started for Creating page");
await fetch(functionUrl, postOptions).then((response) => {
    console.log("Response returned");
    if (response.ok) {
      return response.json()
    }
    else
    {
        var errMsg = "Error detected while adding site page. Server response wasn't OK ";
        console.log(errMsg);
    } 
  }).then((responseJSON: JSON) => {
    responseText = JSON.stringify(responseJSON).trim();
    console.log(responseText);
    if(responseText.toLowerCase().indexOf("uccess") > 0)
        {
          console.log("success feedback");
        }
    if(responseText.toLowerCase().indexOf("rror") > 0)
        {
          console.log("web call errored");
        }
  }
).catch ((response: any) => {
  let errMsg: string = `WARNING - error when calling URL ${functionUrl}. Error = ${response.message}`;
  console.log(errMsg);
});
console.log("wait finished");