Can’t get submodules to work in gitlab

I have a project in my computer with the following structure:

.
├── bin
├── code
│ └── src
├── data
├── doc
├── experiments
└── reports
└── summary

code/src and /reports/summary are submodules defined in .gitmodules

[submodule "code/src"]
path = code/src
url = ./code/src/

[submodule "reports/summary"]
path = reports/summary
url = /home/zunbeltz/Proyectos/reports/base/

I created a project in the gitlab of my workplace (version 7.9.4). After adding the new origin and git push -u origin master The links of the submodules are broken with a 500 error code.

I tried also in gitlab.com, (version 7.14) and I get a 404 error

Does someone know what is going here?

Note: I did post this message on the gitlab forum, but have any answer.

Solution

The idea of submodule is to reference nested git repo with an url that you can access.

./code/src/ and /home/zunbeltz/Proyectos/reports/base/ are file-based url that you can access locally.
But once pushed on Gitlab, said Gitlab wouldn't know how to interpreted/access those urls.
Hence the broken links.

As mentioned in the discussion:

On Gitlab, you would have to have 3 repos:

one for the parent repo
one for each submodules

In the parent repo on GitLab, you would see the same structure as on the local parent repo except GitLab would use a special icon to represent that folder.
That would represent a gitlink, a special entry in the index of a repo.

Ivan mentions in the comments the now (2018, three years later) official documentation "Using Git submodules with GitLab CI".