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Params is an object used by the gRPC methods that generate RPC requests. Params contains request-specific options like headers that should be inserted into the request.

Params.headersobjectObject with key-value pairs representing custom headers the user would like to add to the request.
Params.tagsobjectKey-value pairs where the keys are names of tags and the values are tag values. Response time metrics generated as a result of the request will have these tags added to them, allowing the user to filter out those results specifically, when looking at results data.
Params.timeoutstring / numberRequest timeout to use. Default timeout is 60 seconds ("60s").
The type can also be a number, in which case k6 interprets it as milliseconds, e.g., 60000 is equivalent to "60s".

Example of custom metadata headers and tags

import grpc from 'k6/net/grpc';
const client = new grpc.Client();
client.load([], 'route_guide.proto');
export default function () {
const req = {
latitude: 410248224,
longitude: -747127767,
const params = {
headers: { 'x-my-header': 'k6test' },
tags: { k6test: 'yes' },
const response = client.invoke('main.RouteGuide/GetFeature', req, params);