API 速率限制：限额、响应头与 429 退避策略

HTTP/1.1 429 Too Many Requests
Content-Type: application/json
X-RateLimit-Limit: 600
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 1762534870
Retry-After: 37

{
  "detail": "Session creation rate limit exceeded. You can make up to 600 requests per minute."
}

async function postSession(body) {
  for (let attempt = 0; attempt < 5; attempt++) {
    const res = await fetch("https://verification.didit.me/v3/session/", {
      method: "POST",
      headers: {
        "x-api-key": process.env.DIDIT_API_KEY,
        "Content-Type": "application/json",
      },
      body: JSON.stringify(body),
    });

    if (res.status !== 429) return res;

    const retryAfter = Number(res.headers.get("Retry-After") ?? "1");
    const jitter = Math.random() * 1000;
    await new Promise((r) => setTimeout(r, retryAfter * 1000 + jitter));
  }
  throw new Error("Didit: too many 429s, giving up");
}

import os
import random
import time

import httpx

def post_session(body: dict) -> httpx.Response:
    with httpx.Client(timeout=15) as client:
        for _ in range(5):
            resp = client.post(
                "https://verification.didit.me/v3/session/",
                headers={
                    "x-api-key": os.environ["DIDIT_API_KEY"],
                    "Content-Type": "application/json",
                },
                json=body,
            )
            if resp.status_code != 429:
                return resp
            wait_s = float(resp.headers.get("Retry-After", "1")) + random.random()
            time.sleep(wait_s)
    raise RuntimeError("Didit: too many 429s, giving up")