How to use the apollo-link-http-common.selectHttpOptionsAndBody function in apollo-link-http-common

if (version) {
        clientAwarenessHeaders['apollographql-client-version'] = version;
      }
    }

    const contextHeaders = { ...clientAwarenessHeaders, ...context.headers };

    const contextConfig = {
      http: context.http,
      options: context.fetchOptions,
      credentials: context.credentials,
      headers: contextHeaders,
    };

    //uses fallback, link, and then context to build options
    const { options, body } = selectHttpOptionsAndBody(
      operation,
      fallbackHttpConfig,
      linkConfig,
      contextConfig,
    );

    let controller;
    if (!(options as any).signal) {
      const { controller: _controller, signal } = createSignalIfSupported();
      controller = _controller;
      if (controller) (options as any).signal = signal;
    }

    // If requested, set method to GET if there are no mutations.
    const definitionIsMutation = (d: DefinitionNode) => {
      return d.kind === 'OperationDefinition' && d.operation === 'mutation';

headers
    } = context

    const contextConfig = {
      http: context.http,
      options: context.fetchOptions,
      credentials: context.credentials,
      headers: {
        // Client awareness headers are context overridable.
        ...(name && { 'apollographql-client-name': name }),
        ...(version && { 'apollographql-client-version': version }),
        ...headers
      }
    }

    const { options, body } = selectHttpOptionsAndBody(
      operation,
      fallbackHttpConfig,
      linkConfig,
      contextConfig
    )

    const { clone, files } = extractFiles(body)
    const payload = serializeFetchParameter(clone, 'Payload')

    if (files.size) {
      // Automatically set by fetch when the body is a FormData instance.
      delete options.headers['content-type']

      // GraphQL multipart request spec:
      // https://github.com/jaydenseric/graphql-multipart-request-spec

const optsAndBody = operations.map(operation =>
        selectHttpOptionsAndBody(
          operation,
          fallbackHttpConfig,
          linkConfig,
          contextConfig,
        ),
      );