### Please describe the problem.
I tried using GitLab as a `--type git-lfs` special remote. I followed the steps in https://git-annex.branchable.com/tips/storing_data_in_git-lfs/ for both GitHub and GitLab.
While it worked as described for GitHub I get an error message when trying to push data to GitLab.

### What steps will reproduce the problem?
[[!format sh """
# basic repository setup
mkdir annex
cd annex
git init
git annex init

# create a random binary file
head -c 100 /dev/urandom >random.bin
git annex add .
git commit -a -m added

# set GitHub as a remote (repo exists and is public: https://github.com/iimog/annex)
git remote add github git@github.com:iimog/annex
git push --all github
git annex initremote lfs type=git-lfs encryption=none url=git@github.com:iimog/annex
git annex copy * --to lfs
#copy random.bin (to lfs...) 
#ok                                
#(recording state in git...)

# set GitLab as a remote (repo exists and is public: https://gitlab.com/iimog/annex)
git remote add gitlab git@gitlab.com:iimog/annex
git push --all gitlab
git annex initremote lfs-gitlab type=git-lfs encryption=none url=git@gitlab.com:iimog/annex
#
#  Unable to parse git config from gitlab
#
#  Remote gitlab does not have git-annex installed; setting annex-ignore
#
#  This could be a problem with the git-annex installation on the remote. Please make sure that git-annex-shell is available in PATH when you ssh into the remote. Once you have fixed the git-annex installation, run: git annex enableremote gitlab
#initremote lfs-gitlab ok
#(recording state in git...)
git annex copy * --to lfs-gitlab                                                           
#copy random.bin (to lfs-gitlab...)
#<long error message>
#--> The error in short is a "Bad Request" (details see below)

# Try again after explicitly calling enableremote
git annex enableremote gitlab                                                              
#enableremote gitlab ok
git annex copy * --to lfs-gitlab                                                           
#copy random.bin (to lfs-gitlab...)
#<long error message>
#--> This still results in the same "Bad Request" error
"""]]

### What version of git-annex are you using? On what operating system?
git-annex version: 8.20210903-ga4d179c
Ubuntu 20.04.3 LTS

### Please provide any additional information below.

I initially discovered this issue while using DataLad and reported the issue [here](https://github.com/datalad/datalad/issues/6126).
As suspected by @yarikoptic the issue also exists when using git-annex directly, not through DataLad.

On a self-hosted GitLab instance the following error was found in the server log:
[[!format sh """
2021/10/28 21:07:13 [error] 7412#0: *1869253 client sent invalid chunked body while sending request to upstream, client: <...>, server: <...>, request: "PUT /iimog/my-cool-ds2.git/gitlab-lfs/objects/92f711c1799c5aa936c2be297171d08afc19ba97899b57a1f67f2e70486395aa/80547 HTTP/1.1", upstream: "http://unix/var/opt/gitlab/gitlab-workhorse/sockets/socket:/iimog/my-cool-ds2.git/gitlab-lfs/objects/92f711c1799c5aa936c2be297171d08afc19ba97899b57a1f67f2e70486395aa/80547", host: "<...>"
"""]]

This is the full error message I got when calling `git annex copy * --to lfs-gitlab`:
[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log
$ git annex copy * --to lfs-gitlab

copy random.bin (to lfs-gitlab...) 
                                  
  HttpExceptionRequest Request {
    host                 = "gitlab.com"
    port                 = 443
    secure               = True
    requestHeaders       = [("Authorization","<REDACTED>"),("Content-Type","application/octet-stream"),("Transfer-Encoding","chunked"),("User-Agent","git-annex/8.20210903-ga4d179c")]
    path                 = "/iimog/annex.git/gitlab-lfs/objects/04b38782b7f5990e090577047fb54b52e9771ba57c1c36e21f4702049adfcfe3/100"
    queryString          = ""
    method               = "PUT"
    proxy                = Nothing
    rawBody              = False
    redirectCount        = 10
    responseTimeout      = ResponseTimeoutDefault
    requestVersion       = HTTP/1.1
  }
   (StatusCodeException (Response {responseStatus = Status {statusCode = 400, statusMessage = "Bad Request"}, responseVersion = HTTP/1.1, responseHeaders = [("Server","cloudflare"),("Date","Tue, 09 Nov 2021 15:03:11 GMT"),("Content-Type","text/html"),("Content-Length","155"),("Connection","close"),("CF-RAY","6ab7ed2afb9fdfcf-FRA")], responseBody = (), responseCookieJar = CJ {expose = []}, responseClose' = ResponseClose}) "<html>\r\n<head><title>400 Bad Request</title></head>\r\n<body>\r\n<center><h1>400 Bad Request</h1></center>\r\n<hr><center>cloudflare</center>\r\n</body>\r\n</html>\r\n")
                                  
                                  
  HttpExceptionRequest Request {
    host                 = "gitlab.com"
    port                 = 443
    secure               = True
    requestHeaders       = [("Authorization","<REDACTED>"),("Content-Type","application/octet-stream"),("Transfer-Encoding","chunked"),("User-Agent","git-annex/8.20210903-ga4d179c")]
    path                 = "/iimog/annex.git/gitlab-lfs/objects/04b38782b7f5990e090577047fb54b52e9771ba57c1c36e21f4702049adfcfe3/100"
    queryString          = ""
    method               = "PUT"
    proxy                = Nothing
    rawBody              = False
    redirectCount        = 10
    responseTimeout      = ResponseTimeoutDefault
    requestVersion       = HTTP/1.1
  }
   (StatusCodeException (Response {responseStatus = Status {statusCode = 400, statusMessage = "Bad Request"}, responseVersion = HTTP/1.1, responseHeaders = [("Server","cloudflare"),("Date","Tue, 09 Nov 2021 15:03:12 GMT"),("Content-Type","text/html"),("Content-Length","155"),("Connection","close"),("CF-RAY","6ab7ed2c9a4ad6b5-FRA")], responseBody = (), responseCookieJar = CJ {expose = []}, responseClose' = ResponseClose}) "<html>\r\n<head><title>400 Bad Request</title></head>\r\n<body>\r\n<center><h1>400 Bad Request</h1></center>\r\n<hr><center>cloudflare</center>\r\n</body>\r\n</html>\r\n")
failed                            
copy: 1 failed


# End of transcript or log.
"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)
Yes, I'm using DataLad for some of my projects and I'm really impressed how it makes use of git-annex to solve many of the tasks that I struggled with pure git before.

[[!tag projects/datalad]]

> [[fixed|done]] --[[Joey]]
