IPFS Add With Directory+OnlyHash Through Reverse Proxy Gives Timeout Errors

#### Version information:

```
go-ipfs version: 0.4.22-
Repo version: 7
System version: amd64/linux
Golang version: go1.12.7
```

#### Description:

A user of one of my services has routinely had propblems with go-ipfs nodes timing out when running the `js-ipfs-http-client` equivalent of `go-ipfs` `ipfs add` with a very particular set of options. They have to be:

* `--wrap-with-directory`
* `--only-hash`

When this kind of request is happening I can see logs like the following on my `go-ipfs` node:

```
Oct 22 23:57:35 delta-node-2 ipfs_manager_script.sh[20924]: 23:57:35.234 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 04:05:18 delta-node-2 ipfs_manager_script.sh[20924]: 04:05:18.128 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 04:30:20 delta-node-2 ipfs_manager_script.sh[20924]: 04:30:20.757 ERROR basichost: resetting stream deadline: stream closed basic_host.go:267
Oct 23 05:00:30 delta-node-2 ipfs_manager_script.sh[20924]: 05:00:30.294 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:01:42 delta-node-2 ipfs_manager_script.sh[20924]: 05:01:42.075 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:03:11 delta-node-2 ipfs_manager_script.sh[20924]: 05:03:11.903 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:04:46 delta-node-2 ipfs_manager_script.sh[20924]: 05:04:46.363 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:13:40 delta-node-2 ipfs_manager_script.sh[20924]: 05:13:40.364 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:21:39 delta-node-2 ipfs_manager_script.sh[20924]: 05:21:39.093 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:23:41 delta-node-2 ipfs_manager_script.sh[20924]: 05:23:41.214 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
Oct 23 05:59:38 delta-node-2 ipfs_manager_script.sh[20924]: 05:59:38.902 ERROR core: failure on stop: context canceled; TODO: mock repo builder.go:47
```

It doesn't appear that this option combination will always cause the issue, but more often than not it will. I'm using a custom proxy server I wrote using https://golang.org/pkg/net/http/httputil/ however I highly doubt this is the probelm, as the service is extremely stable under all other conditions, except when this particular option combination is being invoked.