调用PHP接口返回301 Moved Permanently错误，求助解决方法

Hey there, let's work through this 301 redirect issue you're facing. A 301 response means the server is telling you the URL you're requesting has permanently moved to a new location—most likely, your http:// address is being redirected to https:// (a super common security practice). Let's break down solutions for both your HttpURLConnection code and Volley requests.

First, Confirm the Redirect Target #

Before jumping into code changes, let's verify where the redirect is pointing. Run this command in your terminal:

curl -v http://myappdemo.com/payumoney/payUmoneyHashGenerator.php

Look for the Location header in the response—you'll almost certainly see something like https://myappdemo.com/payumoney/payUmoneyHashGenerator.php. That's your new target URL.

Solution 1: Fix HttpURLConnection Code #

You have two straightforward options here:

Option A: Use the HTTPS URL Directly #

This is the most efficient fix, since it skips the extra redirect request entirely. Just update your URL to use https:// instead of http://, and you can remove the setInstanceFollowRedirects(false) line (or set it to true to handle future redirects automatically):

// Replace http with https in your URL
URL url = new URL("https://myappdemo.com/payumoney/payUmoneyHashGenerator.php");
String postParam = postParams[0];
byte[] postParamsByte = postParam.getBytes("UTF-8");

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// Remove this line or set to true: conn.setInstanceFollowRedirects(false);
conn.setRequestProperty("Content-Length", String.valueOf(postParamsByte.length));
conn.setDoOutput(true);
conn.getOutputStream().write(postParamsByte);

// Rest of your response handling code stays the same
InputStream responseInputStream = conn.getInputStream();
StringBuffer responseStringBuffer = new StringBuffer();
byte[] byteContainer = new byte[1024];
for (int i; (i = responseInputStream.read(byteContainer)) != -1; ) {
    responseStringBuffer.append(new String(byteContainer, 0, i));
}
Log.e("tag", "doInBackground: "+ responseStringBuffer.toString());

Option B: Manually Handle the Redirect #

If you want to keep the original URL and handle redirects programmatically, check the response code and re-send the request to the new location:

URL url = new URL("http://myappdemo.com/payumoney/payUmoneyHashGenerator.php");
String postParam = postParams[0];
byte[] postParamsByte = postParam.getBytes("UTF-8");

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", String.valueOf(postParamsByte.length));
conn.setDoOutput(true);
conn.getOutputStream().write(postParamsByte);

// Check for redirect response
int responseCode = conn.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_MOVED_PERM || responseCode == HttpURLConnection.HTTP_MOVED_TEMP) {
    String newUrl = conn.getHeaderField("Location");
    // Re-initialize connection to the new URL
    conn.disconnect();
    conn = (HttpURLConnection) new URL(newUrl).openConnection();
    // Re-apply all request settings
    conn.setRequestMethod("POST");
    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    conn.setRequestProperty("Content-Length", String.valueOf(postParamsByte.length));
    conn.setDoOutput(true);
    conn.getOutputStream().write(postParamsByte);
}

// Proceed with reading the response
InputStream responseInputStream = conn.getInputStream();
// ... rest of your code

Solution 2: Fix Volley Request #

Volley should handle 301 redirects by default, but it often fails if the redirect is from http to https. The easiest fix is again to use the HTTPS URL directly:

String url = "https://myappdemo.com/payumoney/payUmoneyHashGenerator.php";

StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
        response -> {
            // Handle successful response here
            Log.e("tag", "Volley response: " + response);
        },
        error -> {
            // Handle error here
            Log.e("tag", "Volley error: " + error.getMessage());
        }) {
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        // Add your POST parameters here
        Map<String, String> params = new HashMap<>();
        params.put("your_param_key", postParams[0]); // Adjust based on your actual params
        return params;
    }
};

// Add the request to Volley's queue
Volley.newRequestQueue(getApplicationContext()).add(stringRequest);

If you still run into issues, double-check that your app has internet access permission—make sure your AndroidManifest.xml includes <uses-permission android:name="android.permission.INTERNET"/>.

内容的提问来源于stack exchange，提问作者Bharat Kumar Emani