[Python] "400 Request is missing 'x-goog-request-params' header" when using dictionary as parameter in functions that use routing headers

[tswast]

See: googleapis/google-cloud-python#7220 for how this manifests in the BigQuery Storage API.

[andreamlin]

@vam-google would you mind taking a look at this?

[vchudnov-g]

@vam-google @hzyi-google Any updates on this? We're out of SLO.

[vchudnov-g]

@hzyi-google Is this an issue for Java and PHP? If so, we should fix this.

[tswast]

I didn't check Java / PHP for related issues. This surfaces in Python when you pass in a dictionary instead of an explicit request object. e.g.

session = client.create_read_session(
    {
        "project_id": "swast-scratch",
        "dataset_id": "schema_examples",
        "table_id": "array_struct",
    },
    "projects/swast-scratch")

[hkdevandla]

@software-dov, can you triage this? I'm not sure if this still an issue in the new python micro-generator. Please advice.