okHttp3 response.code() 不会 return 304

okHttp3 response.code() won't return 304

我在 android 应用程序上使用 OkHttp3 来侦听网络服务,保持问题的基本性,以下是 trik 的作用:

try(Response response = client.newCall(request).execute()) {
    responseBody = response.body().string();
    responseHeaders = response.headers();

    serviceContent = responseBody; // store response content in class' property
    serviceHeaders = responseHeaders; // store response headers in class' property
    serviceStatusCode = response.code(); // store response status code in class' property
} catch(IOException e) {
    e.printStackTrace();
}

然后在我的 activity 中,我使用 serviceStatusCode 以不同的方式处理网络服务响应。

我正在收听的服务之一是 SkyScanner,它可能 return 304 表明响应已经创建,您必须使用本地存储的先前响应。

我一切正常,但是当 SkyScanner returns 304 我无法捕捉到它时,这是我用来根据我 activity 中的代码处理响应的方式:

switch(statusCode) {
    case 304: {
        // Get data from local DB
        break;
    }
    case 200: {}
    // And so on
}

问题是 statusCode 是 200(由 response.code() 填充),即使 Fiddler 说它是 304。为什么 response.code() 不会 return 304 如果一个304 是 returned?

看看here (section 'Reduce processing'):

On a 304 status, Retrofit2 and OkHttp3 will pretend this response was equal to the last response; the cached response is returned. To notice the 304, check the raw response code:

if (response.isSuccessful() &&
    response.raw().networkResponse() != null &&
    response.raw().networkResponse().code() ==
           HttpURLConnection.HTTP_NOT_MODIFIED) {
    // not modified, no need to do anything.
    return;
}

// parse response here 

Getting the normal (not raw) response code would give you the cached status code, probably 200 OK