# HTTPS request using Req and DNS over HTTPS

**URL:** <https://forum.elixirforum.com/t/https-request-using-req-and-dns-over-https/62162>\
**Category:** Questions\
**Tags:** https, dns, req\
**Created:** [March 7, 2024, 7:59pm UTC](https://forum.elixirforum.com/t/https-request-using-req-and-dns-over-https/62162 "2024-03-07T19:59:21Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![raleng](https://forum.elixirforum.com/letter_avatar_proxy/v4/letter/r/b9e5f3/32.png) [@raleng](https://forum.elixirforum.com/u/raleng)\
**Post date:** [March 7, 2024, 7:59pm UTC](https://forum.elixirforum.com/t/https-request-using-req-and-dns-over-https/62162/1 "2024-03-07T19:59:21Z")

</div>

Hey everyone,

I’m still pretty new to Elixir so I don’t have any experience with any HTTP library, but ran into an issue using Req. Since I was able to solve my problem using HTTPoisen, this post is more out of curiosity, whether there _is_ a solution using Req and what I might have missed/misunderstood.

### Problem

I want to fetch a JSON file from a HTTPS URL using a DNS over HTTPS service (Cloudflare’s, in this case). The JSON file might be hosted at the resolved IP address, or it might redirect yet another time.

I put up some sample projects for my own testing (they are still live):  
`https://vercel-redirect-test-json.vercel.app/some.json`  
redirects to  
`https://vercel-static-test-json.vercel.app/some.json`  
where `some.json` is hosted.

### Using cURL and HTTPoison works!

In the terminal I use `dig` to look up the IP address and can resolve the JSON file using cURL with the `--resolve` option:

```elixir
curl -L --resolve vercel-redirect-test-json.vercel.app:443:76.76.21.61 \
    https://vercel-redirect-test-json.vercel.app/some.json

```

I was able to get the request working using HTTPoison and hackney:

```elixir
resolved_ip = "76.76.21.61" # this would be the result of the dns-query to Cloudflare
domain = "vercel-redirect-test-json.vercel.app"
resolve_option = {:resolve, [{domain, 443, ip}]

HTTPoison.get(
  "https://#{domain}/some.json",
  [],
  follow_redirect: true,
  hackney: [options: [resolve_option]]
)

```

### How to use Req?

I did not find anything like a `resolve` option, and while I can resolve the “statically” hosted file by specifically providing the hostname to avoid any SSL errors,

```elixir
resolved_ip = "76.76.21.61" # this would be the result of the dns-query to Cloudflare
domain = "vercel-static-test-json.vercel.app"
request =
  Req.new(
    method: :get,
    url: "https://#{ip}/some.json",
    connect_options: [hostname: domain]
  )

Req.get(request) # this works, the response has the JSON object!

```

I get repeated debug logs when trying to use the redirected version `https://vercel-redirect-test-json.vercel.app/some.json`

```elixir
[debug] redirecting to https://vercel-static-test-json.vercel.app/some.json

```

and error out in the end with `** (RuntimeError) too many redirects (10)`.

What am I doing wrong?