POST request takes about 2 minutes to complete in WebGL

I have an app that communicates with an external server I have set up. It does GET and POSTS. The GET requests are quick, but the POST requests take about 2 minutes. It works just fine when I build it for desktop or if I'm just testing it from inside unity. Its only when I build it for WebGL. I'm not getting any errors when I look at it through a dev build, it just hangs for around 2 minutes, then finishes.

Here's my POST code (pretty basic)

Code (CSharp):

1.     public IEnumerator postAction(string action)
2.     {
3.         WWWForm form = new WWWForm();
4.         form.AddField("actionName", action);
5.         using (UnityWebRequest www = UnityWebRequest.Post("http:/webaddress.example/callAction", form))
6.         {
7.             yield return www.SendWebRequest();
8.  
9.             if (www.isNetworkError || www.isHttpError)
10.             {
11.                 Debug.Log(www.error);
12.             }
13.             else
14.             {
15.                 Debug.Log("Form upload complete!");
16.             }
17.         }
18.     }

Code (CSharp):

1.     public void enterPassword()
2.     {
3.         if (inputField.text.ToLower() == password.ToLower())
4.         {
5.             accessGranted.SetActive(true);
6.             StartCoroutine(masterScript.postAction("perp"));
7.         }