using curl with trusted timestampgin

I would like to use the curl library, to get the trusted timestamp of a message. The command I use is the following:

curl --data-binary @inputfile http://url_to_test_tsa --header "Content-type: application/timestamp-requ开发者_JS百科est"

The problem is, that whatever tsa (timestamping authority) I use, I always get back a server error. The content of @inputfile is a 40 character length sha1 or md5 hash.

What might be the problem?

---

From the man page: This posts data exactly as specified with no extra processing whatsoever

So if you use that option, you need to do the processing yourself.

---

basing on this original post and making a few correction, I ended up with the following simplified script to get a somewhat valid reply from a Timestamping Authority (given that I've created example.txt file with some gibberish):

openssl ts -query -data example.txt -cert -sha256 -out request.tsq
curl -H "Content-Type:application/timestamp-query" --data-binary @request.tsq http://demo.sk.ee/tsa --output response.tsr

note that some timestamping services behave differently - e.g. the one I used as an example above doesn't like a timestamping request created using SHA-1 algorithm for the hash (i.e. the output of above openssl command without -sha256 parameter). Also it seems that the header supplied above is not mandatory, i.e. both services I tried replied with valid response when I didn't use the header at all. Here's openssl ts man page.