function addContentType(req) {
    var httpRequest = req.httpRequest;
    if (httpRequest.method === 'GET' || httpRequest.method === 'HEAD') {
      // Content-Type is not set in GET/HEAD requests
      delete httpRequest.headers['Content-Type'];
      return;
    }

    if (!httpRequest.headers['Content-Type']) { // always have a Content-Type
      httpRequest.headers['Content-Type'] = 'application/octet-stream';
    }

    var contentType = httpRequest.headers['Content-Type'];
    if (AWS.util.isBrowser()) {
      if (typeof httpRequest.body === 'string' && !contentType.match(/;\s*charset=/)) {
        var charset = '; charset=UTF-8';
        httpRequest.headers['Content-Type'] += charset;
      } else {
        var replaceFn = function(_, prefix, charsetName) {
          return prefix + charsetName.toUpperCase();
        };

        httpRequest.headers['Content-Type'] =
          contentType.replace(/(;\s*charset=)(.+)$/, replaceFn);
      }
    }
  }
function addContentType(req) {
    var httpRequest = req.httpRequest;
    if (httpRequest.method === 'GET' || httpRequest.method === 'HEAD') {
      // Content-Type is not set in GET/HEAD requests
      delete httpRequest.headers['Content-Type'];
      return;
    }

    if (!httpRequest.headers['Content-Type']) { // always have a Content-Type
      httpRequest.headers['Content-Type'] = 'application/octet-stream';
    }

    var contentType = httpRequest.headers['Content-Type'];
    if (AWS.util.isBrowser()) {
      if (typeof httpRequest.body === 'string' && !contentType.match(/;\s*charset=/)) {
        var charset = '; charset=UTF-8';
        httpRequest.headers['Content-Type'] += charset;
      } else {
        var replaceFn = function(_, prefix, charsetName) {
          return prefix + charsetName.toUpperCase();
        };

        httpRequest.headers['Content-Type'] =
          contentType.replace(/(;\s*charset=)(.+)$/, replaceFn);
      }
    }
  }
function addContentType ( req ) { var httpRequest = req . httpRequest ; if ( httpRequest . method === 'GET' || httpRequest . method === 'HEAD' ) { // Content-Type is not set in GET/HEAD requests delete httpRequest . headers [ 'Content-Type' ] ; return ; } if ( ! httpRequest . headers [ 'Content-Type' ] ) { // always have a Content-Type httpRequest . headers [ 'Content-Type' ] = 'application/octet-stream' ; } var contentType = httpRequest . headers [ 'Content-Type' ] ; if ( AWS . util . isBrowser ( ) ) { if ( typeof httpRequest . body === 'string' && ! contentType . match ( / ;\s*charset= / ) ) { var charset = '; charset=UTF-8' ; httpRequest . headers [ 'Content-Type' ] += charset ; } else { var replaceFn = function ( _ , prefix , charsetName ) { return prefix + charsetName . toUpperCase ( ) ; } ; httpRequest . headers [ 'Content-Type' ] = contentType . replace ( / (;\s*charset=)(.+)$ / , replaceFn ) ; } } }
Adds a default content type if none is supplied.

@api private
Adds a default content type if none is supplied .
Add Content - Type header