Axios/XMLHttpRequest is sending GET instead of POST in production environment

I am running into a very strange issue. We are putting an app into production and one of the POST request is turning into a POST followed directly by a GET request to the same URL and the POST is never received in the backend (Laravel). In the chrome network tab it just looks like just a GET but with Burpsuite we can see the POST request.

The code responsible

async store() {
    // This prints post
    console.log(this.method());

    await this.form[this.method()]('/api/admin/users/' + (this.isUpdate() ? this.id : ''));

    if (!this.isUpdate()) {
        this.form.reset();
    }
},

The form.post method content

return new Promise((resolve, reject) => {
    axios[requestType](url, this.data())
    .then(response => {
        this.busy = false;
        this.onSuccess(response.data);
        resolve(response.data);
    })
    .catch(error => {
        this.busy = false;
        if (error.response.status == 400) {
            return this.displayErrors(error.response.data)
        }
        this.onFail(error.response.data.errors);
        reject(error.response.data);
    });
});

This question was also answered by me in the Larachat slack forum, and for others sake here is the answer for the next one with such a problem.

Just a little back story. In the chat we found out that it was receiving a 301 error which is a redirect error. I had the same error recently when posting to a url on a staging server, it was working fine locally but not on the staging server.

The problem appeared to be a slash at the end of the post url.

So posting to https://example.com/post/to/ will not work.

Removing the / and posting to https://example.com/post/to will work.