using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

public class C_UnityWebRequest : MonoBehaviour
{
static C_UnityWebRequest instance;
public static C_UnityWebRequest Instance
{
get
{
if (instance == null)
{
GameObject mounter = new GameObject("C_UnityWebRequest");
instance = mounter.AddComponent();
}
return instance;
}
}

/// <summary>  
/// get请求  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
public void Get(string url, Action<UnityWebRequest> actionResult)  
{  
    StartCoroutine(\_Get(url, actionResult));  
}

/// <summary>  
/// 下载文件  
/// </summary>  
/// <param name="url"></param>  
/// <param name="downloadFilePathAndName"></param>  
/// <param name="actionResult"></param>  
public void DownloadFile(string url, string downloadFilePathAndName, Action<UnityWebRequest> actionResult)  
{  
    StartCoroutine(\_DownloadFile(url, downloadFilePathAndName, actionResult));  
}

/// <summary>  
/// 请求图片  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
public void GetTexture(string url, Action<Texture2D> actionResult)  
{  
    StartCoroutine(\_GetTexture(url, actionResult));  
}

/// <summary>  
/// 请求assetBuddle  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
public void GetAssetBundle(string url, Action<AssetBundle> actionResult)  
{  
    StartCoroutine(\_GetAssetBundle(url, actionResult));  
}

/// <summary>  
/// 下载音效  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
/// <param name="audioType"></param>  
public void GetAudioClip(string url, Action<AudioClip> actionResult, AudioType audioType = AudioType.WAV)  
{  
    StartCoroutine(\_GetAudioClip(url, actionResult, audioType));  
}

/// <summary>  
/// post form  
/// </summary>  
/// <param name="serverURL"></param>  
/// <param name="lstformData"></param>  
/// <param name="actionResult"></param>  
public void Post(string serverURL, List<IMultipartFormSection> lstformData, Action<UnityWebRequest> actionResult)  
{  
    //List<IMultipartFormSection> formData = new List<IMultipartFormSection>();  
    //formData.Add(new MultipartFormDataSection("field1=foo&field2=bar"));  
    //formData.Add(new MultipartFormFileSection("my file data", "myfile.txt"));  
    StartCoroutine(\_Post(serverURL, lstformData, actionResult));  
}

/// <summary>  
/// put方法  
/// </summary>  
/// <param name="url"></param>  
/// <param name="contentBytes"></param>  
/// <param name="actionResult"></param>  
public void UploadByPut(string url, byte\[\] contentBytes, Action<bool> actionResult)  
{  
    StartCoroutine(\_UploadByPut(url, contentBytes, actionResult, ""));  
}

/// <summary>  
/// get  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
/// <returns></returns>  
IEnumerator \_Get(string url, Action<UnityWebRequest> actionResult)  
{  
    using (UnityWebRequest uwr = UnityWebRequest.Get(url))  
    {  
        yield return uwr.SendWebRequest();  
        if (actionResult != null)  
        {  
            actionResult(uwr);  
        }  
    }  
}

/// <summary>  
/// 下载文件  
/// </summary>  
/// <param name="url"></param>  
/// <param name="downloadFilePathAndName"></param>  
/// <param name="actionResult"></param>  
/// <returns></returns>  
IEnumerator \_DownloadFile(string url, string downloadFilePathAndName, Action<UnityWebRequest> actionResult)  
{  
    var uwr = new UnityWebRequest(url, UnityWebRequest.kHttpVerbGET);  
    uwr.downloadHandler = new DownloadHandlerFile(downloadFilePathAndName);  
    yield return uwr.SendWebRequest();  
    if (actionResult != null)  
    {  
        actionResult(uwr);  
    }  
}

/// <summary>  
/// 下载图片  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
/// <returns></returns>  
IEnumerator \_GetTexture(string url, Action<Texture2D> actionResult)  
{  
    UnityWebRequest uwr = new UnityWebRequest(url);  
    DownloadHandlerTexture downloadTexture = new DownloadHandlerTexture(true);  
    uwr.downloadHandler = downloadTexture;  
    yield return uwr.SendWebRequest();  
    Texture2D t = null;  
    if (!(uwr.isNetworkError || uwr.isHttpError))  
    {  
        t = downloadTexture.texture;  
    }  
    if (actionResult != null)  
    {  
        actionResult(t);  
    }  
}

/// <summary>  
/// 下载AssetBuddle  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
/// <returns></returns>  
IEnumerator \_GetAssetBundle(string url, Action<AssetBundle> actionResult)  
{  
    UnityWebRequest www = new UnityWebRequest(url);  
    DownloadHandlerAssetBundle handler = new DownloadHandlerAssetBundle(www.url, uint.MaxValue);  
    www.downloadHandler = handler;

    yield return www.SendWebRequest();

    AssetBundle bundle = null;

    if (!(www.isNetworkError || www.isHttpError))  
    {  
        bundle = handler.assetBundle;  
    }

    if (actionResult != null)  
    {  
        actionResult(bundle);  
    }  
}

/// <summary>  
/// 下载音效  
/// </summary>  
/// <param name="url"></param>  
/// <param name="actionResult"></param>  
/// <param name="audioType"></param>  
/// <returns></returns>  
IEnumerator \_GetAudioClip(string url, Action<AudioClip> actionResult, AudioType audioType = AudioType.WAV)  
{  
    using (var uwr = UnityWebRequestMultimedia.GetAudioClip(url, audioType))  
    {  
        yield return uwr.SendWebRequest();

        if (!(uwr.isNetworkError || uwr.isHttpError))  
        {  
            if (actionResult != null)  
            {  
                actionResult(DownloadHandlerAudioClip.GetContent(uwr));  
            }  
        }  
    }  
}

/// <summary>  
/// 表单下载  
/// </summary>  
/// <param name="serverURL"></param>  
/// <param name="lstformData"></param>  
/// <param name="actionResult"></param>  
/// <returns></returns>  
IEnumerator \_Post(string serverURL, List<IMultipartFormSection> lstformData, Action<UnityWebRequest> actionResult)  
{  
    //List<IMultipartFormSection> formData = new List<IMultipartFormSection>();  
    //formData.Add(new MultipartFormDataSection("field1=foo&field2=bar"));  
    //formData.Add(new MultipartFormFileSection("my file data", "myfile.txt"));  
    UnityWebRequest uwr = UnityWebRequest.Post(serverURL, lstformData);

    yield return uwr.SendWebRequest();

    if (actionResult != null)  
    {  
        actionResult(uwr);  
    }  
}

/// <summary>  
/// put  
/// </summary>  
/// <param name="url"></param>  
/// <param name="contentBytes"></param>  
/// <param name="actionResult"></param>  
/// <param name="contentType"></param>  
/// <returns></returns>  
IEnumerator \_UploadByPut(string url, byte\[\] contentBytes, Action<bool> actionResult, string contentType = "application/octet-stream")  
{  
    UnityWebRequest uwr = new UnityWebRequest();  
    UploadHandler uploader = new UploadHandlerRaw(contentBytes);  
    // Sends header: "Content-Type: custom/content-type";  
    uploader.contentType = contentType;  
    uwr.uploadHandler = uploader;

    yield return uwr.SendWebRequest();

    bool res = true;  
    if (uwr.isNetworkError || uwr.isHttpError)  
    {  
        res = false;  
    }

    if (actionResult != null)  
    {  
        actionResult(res);  
    }  
}  

}

ZT:https://www.jianshu.com/p/3da9191f82a0