Edge function reports 525 error.

[ifyour]

Hello, thank you for sharing this implementation method. It has inspired me to deploy a deeplx API on edge functions using a similar approach. However, I keep getting error 525 and would like to seek your help.

// src/pages/api/translate.ts

import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

interface RequestParams {
  text: string;
  source_lang: string;
  target_lang: string;
}

interface ResponseParams {
  id: number;
  code: number;
  data: string;
}

async function queryAPI(data: RequestParams): Promise<ResponseParams> {
  const res = await fetch("https://www2.deepl.com/jsonrpc", {
    headers: {
      "Content-Type": "application/json; charset=utf-8",
    },
    method: "POST",
    body: buildBodyString(data),
  });

  if (res.ok) {
    const result = (await res.json()) as {
      jsonrpc: string;
      id: number;
      result: {
        texts: {
          text: string;
        }[];
      };
    };
    return {
      id: result.id,
      code: 200,
      data: result?.result?.texts?.[0]?.text,
    };
  }
  return {
    id: 42,
    code: res.status,
    data:
      res.status === 429
        ? "Too many requests, please try again later."
        : "Unknown error.",
  };
}

function buildRequestParams(sourceLang: string, targetLang: string) {
  return {
    jsonrpc: "2.0",
    method: "LMT_handle_texts",
    id: Math.floor(Math.random() * 100000 + 100000) * 1000,
    params: {
      texts: [{ text: "", requestAlternatives: 3 }],
      timestamp: 0,
      splitting: "newlines",
      lang: {
        source_lang_user_selected: sourceLang,
        target_lang: targetLang,
      },
    },
  };
}

function getCountOfI(translateText: string) {
  return translateText.split("i").length - 1;
}

function getTimestamp(iCount: number) {
  let ts = new Date().getTime();
  if (iCount !== 0) {
    iCount = iCount + 1;
    return ts - (ts % iCount) + iCount;
  } else {
    return ts;
  }
}

function buildBodyString(data: RequestParams) {
  const post_data = buildRequestParams(
    data.source_lang || "AUTO",
    data.target_lang || "AUTO"
  );
  post_data.params.texts = [{ text: data.text, requestAlternatives: 3 }];
  post_data.params.timestamp = getTimestamp(getCountOfI(data.text));
  let post_str = JSON.stringify(post_data);
  if (
    [0, 3].includes((post_data["id"] + 5) % 29) ||
    (post_data["id"] + 3) % 13 === 0
  ) {
    post_str = post_str.replace('"method":"', '"method" : "');
  } else {
    post_str = post_str.replace('"method":"', '"method": "');
  }

  return post_str;
}

export const config = {
  runtime: "edge",
};

export default async function MyEdgeFunction(request: NextRequest) {
  const req = (await request.json()) as RequestParams;
  const res = await queryAPI(req);
  return NextResponse.json(res);
}

After debugging locally and confirming normal operation, I encountered a persistent 525 error after deploying to the edge function. Can you advise me on how to solve this problem?

curl --location 'https://deeplx-edge-api.vercel.app/api/translate' \
--header 'Content-Type: application/json' \
--data '{
    "text": "你好呀，请问你来自哪里",
    "source_lang": "auto",
    "target_lang": "en"
}'
{"id":42,"code":525,"data":"Unknown error."}

curl --location '127.0.0.1:3000/api/translate' \
--header 'Content-Type: application/json' \
--data '{
    "text": "请给我一个冰淇淋",
    "source_lang": "zh",
    "target_lang": "en"
}'
{"id":115601000,"code":200,"data":"Please give me an ice cream"}

[x-dr]

I tried deploying with Vercel and Cloudflare Worker, but encountered the same error. It's likely that Deepl has some limitations.

[ifyour]

Thank you for your response. I also tried both methods, but they ultimately failed. In the end, I used server deployment and ran a Go service on my virtual server, which worked properly.