How to return a simple image from external API using NestJs?

I've been using this new framework for a while and it's pretty funny to code with , but I got in trouble and i'm stuck, so here I am asking for some help

My problem is pretty common I guess in another frameworks or languages. I need to get an image from an external API, I'm calling to the following URL for example :

https://s2.coinmarketcap.com/static/img/coins/32x32/1.png

But there is a little problem, in my final app I don't know what is the id of the image im looking for, see that on the end of the above url there is a number + ".png" this number is the id of the cryptocurrency in this case. So , if I want to get this logo/image knowing only the name of the cryptocurrency I have to query to another URL and search for it's ID, well that's not a problem, and I actually achieved it pretty easy:

public getImageByName(name: string): Observable<any> {
    return this.fetchCMCFullData()
      .pipe(
        map(entry => {
          return Object.keys(entry)
            .map(entradaKey => {
              return entry[entradaKey];
            })
            .find(valorMapeado => valorMapeado.slug == name);
        }),
      )
      .pipe(
        mergeMap(resultado =>
          this.httpService
            .get(
              'https://s2.coinmarketcap.com/static/img/coins/32x32/' +
                resultado.id +
                '.png',
              {
                headers: {
                  'Content-Type': 'image/png',
                },
              },
            )
            .pipe(map(response => response.data)),
        ),
      );
  }

As you may understand, the "fetchCMCFullData" returns me the data needed to get the id of the crypto and then I query for it's image, my problem is that what im receiving is not an image, is a large cup of binary macarroni like those:

�PNG


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I've been trying to play with the response headers and more parameters but I was not be able to achieve it, so please help

Also my controller method is the following:

@Get('getExchangeIMG/:exchangeName')
  returnExchangeIMG(@Param('exchangeName') exchName) {
    return this.exchangeCordinatorService.getImageByName(exchName);
  }

Ty in advance

Well after some days of research I've found the issue, there was a problem with the underlying library NestJs uses for the requests, axios-http , which saves everything in a JSON, so if I want to get a binary code image it will save it on the JSON as string and will break the binary.

To fix this we must parse the parsed binary on the JSON to a Buffen and then transform it to a base64 for instance:

 res.send({
                imagen: Buffer.from(response.data, 'binary').toString(
                  'base64',
                ),
                extension: 'base64',
              }),