import sentry_sdk
from flask import Flask

seen = []
sentry_sdk.init(dsn="http://k@localhost/1", transport=lambda event: seen.append(event))

app = Flask(__name__)
app.logger.disabled = True


@app.route("/")
def index():
    raise ValueError("boom")


ips = {
    "X-Forwarded-For": "203.0.113.1",
    "X-Real-IP": "203.0.113.2",
    "CF-Connecting-IP": "203.0.113.3",
    "True-Client-IP": "203.0.113.4",
    "Forwarded": "for=203.0.113.5",
    "X-Client-IP": "203.0.113.6",
}
app.test_client().get("/", headers=ips)
sentry_sdk.flush()
sent = {k.lower(): v for k, v in seen[0]["request"]["headers"].items()}
for name in ips:
    print(f"{name:18} {sent.get(name.lower(), '(not sent)') or '(blanked)'}")

X-Forwarded-For    (blanked)
X-Real-IP          (blanked)
CF-Connecting-IP   203.0.113.3
True-Client-IP     203.0.113.4
Forwarded          for=203.0.113.5
X-Client-IP        203.0.113.6