HEAD response from AWS in Android fails

Version: 0.10.13

Requesting HEAD from AWS S3 should return the headers of an object. The headers contain Content-Length header which represents the size of the object.

And as it is known HEAD responses have no body.

Anyway in RNFetchBlobReq.java the HEAD response is handled as it would have body and in line 505 bytes() method is called:

byte[] b = resp.body().bytes();

And in okhttp3 an IOException is raised if Content-Length does not match the body length:

  public final byte[] bytes() throws IOException {
    long contentLength = contentLength();
    if (contentLength > Integer.MAX_VALUE) {
      throw new IOException("Cannot buffer entire body for content length: " + contentLength);
    }

    BufferedSource source = source();
    byte[] bytes;
    try {
      bytes = source.readByteArray();
    } finally {
      Util.closeQuietly(source);
    }
    if (contentLength != -1 && contentLength != bytes.length) {
      throw new IOException("Content-Length ("
          + contentLength
          + ") and stream length ("
          + bytes.length
          + ") disagree");
    }
    return bytes;
  }

So this ruins pretty bad requesting metadata from AWS.

[sakarit]

@JofBigHealth Hey, so glad that I could help you out. 😃

This bug made me very frustrated back then and I researched and researched it until found that last resort like solution.

Really hope that it will get fixed some day, rn-fetch-blob is good stuff otherwise!

[hurajgor]

Note: the problem also seems related to rn-fetch-blob using .byteStream() ahead of .body() as per this StackOverflow issue. Possible? By hard-coding a replacement to .byteStream() here I was able to avoid the exception.

Hey @JofBigHealth / @sakarit,

I tried using your approach but I’m not getting any response back even though the server is sending back the response. Could you please help me out with it?