elukey@deploy1002:~$ cat inference_staging.yaml 
https://enwiki-goodfaith.revscoring-editquality-goodfaith.wikimedia.org:
- path: /v1/models/enwiki-goodfaith:predict
  request_headers:
    "Content-Type": "application/json"
    "Accept-Encoding": "application/json"
  form_body: 
    "rev_id": 1234567
  assert_status: 200
  assert_body_contains: probability
  method: POST

elukey@deploy1002:~$ httpbb --host inference-staging.svc.codfw.wmnet --https_port 30443 inference_staging.yaml 
Sending to inference-staging.svc.codfw.wmnet...
https://enwiki-goodfaith.revscoring-editquality-goodfaith.wikimedia.org/v1/models/enwiki-goodfaith:predict (inference_staging.yaml:2)
    Status code: expected 200, got 400.
    Body: expected to contain 'probability', got '{"error":"Unrecognized request format: unexpected '... (87 characters total).
===
FAIL: 1 request sent to inference-staging.svc.codfw.wmnet. 1 request with failed assertions.

import requests
import json

r = requests.post('https://inference-staging.svc.codfw.wmnet:30443/v1/models/enwiki-goodfaith:predict',
                  data={'rev_id': 123456789},
                  headers={"Content-type": "application/json",
                           "Host": "enwiki-goodfaith.revscoring-editquality-goodfaith.wikimedia.org"})

print(f"Test 1: HTTP {r.status_code} and body {r.text}")

r = requests.post('https://inference-staging.svc.codfw.wmnet:30443/v1/models/enwiki-goodfaith:predict',
                  data=json.dumps({"rev_id": 123456}),
                  headers={"Content-type": "application/json",
                           "Host": "enwiki-goodfaith.revscoring-editquality-goodfaith.wikimedia.org"})

print(f"Test 2: HTTP {r.status_code} and body {r.text}")

r = requests.post('https://inference-staging.svc.codfw.wmnet:30443/v1/models/enwiki-goodfaith:predict',
                  json={'rev_id': 123456789},
                  headers={"Content-type": "application/json",
                           "Host": "enwiki-goodfaith.revscoring-editquality-goodfaith.wikimedia.org"})

print(f"Test 3: HTTP {r.status_code} and body {r.text}")

Test 1: HTTP 400 and body {"error":"Unrecognized request format: unexpected character: line 1 column 1 (char 0)"}
Test 2: HTTP 200 and body {"enwiki":{"models":{"goodfaith":{"version":"0.5.1"}},"scores":{"123456":{"goodfaith":{"score":{"prediction":true,"probability":{"false":0.03387957196040836,"true":0.9661204280395916}}}}}}}
Test 3: HTTP 200 and body {"enwiki":{"models":{"goodfaith":{"version":"0.5.1"}},"scores":{"123456789":{"goodfaith":{"score":{"prediction":true,"probability":{"false":0.025037544564238123,"true":0.9749624554357619}}}}}}}