Params are missing when using http streams

[ejizba]

When using http streams, the request.params object will be an empty object. The suggested workaround is to use a package like path-to-regexp to parse the request.url property. Keep in mind that Azure Functions only supports ASP.NET Core route templates (i.e. user/{name}) when registering your function, so you will likely need to use a different syntax (i.e. /user/:name) when parsing the url. Here is example code using the suggested workaround:

import { app, HttpRequest, HttpResponseInit, InvocationContext } from '@azure/functions';
import { match } from 'path-to-regexp';

export async function httpTrigger1(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
    const parseRoute = match('/api/user/:name');
    const route = parseRoute(new URL(request.url).pathname);
    const params = route ? (route.params as Record<string, string>) : {};

    const name = params.name || 'world';

    return { body: `Hello, ${name}!` };
}

app.http('httpTrigger1', {
    methods: ['GET', 'POST'],
    route: 'user/{name}',
    authLevel: 'anonymous',
    handler: httpTrigger1,
});

Related to Azure/azure-functions-host#9840