okhttp 3:如何使用Java/Android手动解压缩gzip/平减响应
我知道，默认情况下，okhttp3库会添加头部Accept-Encoding: gzip，并为我们自动解码响应。
我正在处理的问题是，一个只接受头部的主机，比如：Accept-Encoding: gzip, deflate，如果我不添加deflate部件，它就会失败。现在，当我手动将该头添加到okhttp客户端时，库不再为我进行解压缩。
我尝试了多个解决方案来获取响应并尝试手动解压缩，但是我始终得到一个例外，即java.util.zip.ZipException: Not in GZIP format，下面是我迄今为止尝试过的：
//decompresser
public static String decompressGZIP(InputStream inputStream) throws IOException
{
InputStream bodyStream = new GZIPInputStream(inputStream);
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int length;
while ((length = bodyStream.read(buffer)) > 0)
{
outStream.write(buffer, 0, length);
}
return new String(outStream.toByteArray());
}
//run scraper
scrape(api, new Callback()
{
// Something went wrong
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e)
{
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException
{
if (response.isSuccessful())
{
try
{
InputStream responseBodyBytes = responseBody.byteStream();
returnedObject = GZIPCompression.decompress(responseBodyBytes);
if (returnedObject != null)
{
String htmlResponse = returnedObject.toString();
}
}
catch (ProtocolException e){}
if(response != null) response.close();
}
}
});
private Call scrape(Map<?, ?> api, Callback callback)
{
MediaType JSON = MediaType.parse("application/json; charset=utf-8");
String method = (String) api.get("method");
String url = (String) api.get("url");
Request.Builder requestBuilder = new Request.Builder().url(url);
RequestBody requestBody;
requestBuilder.header("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0");
requestBuilder.header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
requestBuilder.header("Accept-Language", "en-US,en;q=0.5");
requestBuilder.header("Accept-Encoding", "gzip, deflate");
requestBuilder.header("Connection", "keep-alive");
requestBuilder.header("Upgrade-Insecure-Requests", "1");
requestBuilder.header("Cache-Control", "max-age=0");
Request request = requestBuilder.build();
Call call = client.newCall(request);
call.enqueue(callback);
return call;
}请注意，响应头将始终返回Content-Encoding: gzip和Transfer-Encoding: chunked
还有一件事，我也在this topic中尝试过这个解决方案，但是它在D/OkHttp: java.io.IOException: ID1ID2: actual 0x00003c68 != expected 0x00001f8b中还是失败了。
任何帮助都将不胜感激..。
回答 3
Stack Overflow用户
发布于 2018-08-17 21:02:43
经过6个小时的挖掘，我找到了正确的解决方案，和往常一样，它比我想象的更容易，所以我基本上尝试解压一个没有压缩的页面，因为它失败了。现在，一旦我点击了第二个页面(它是压缩的)，我就会得到一个gzipped响应，上面的代码应该在其中处理它。另外，如果有人想要解决方案，我使用了一个修改过的拦截器，就像在this answer中一样，所以您不需要使用自定义函数来处理解压缩。
我修改了unzip方法，使okhttp interceptor能够处理压缩和未压缩的响应：
OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder().addInterceptor(new UnzippingInterceptor());
OkHttpClient client = clientBuilder.build();阻断器就像dis：
private class UnzippingInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
Response response = chain.proceed(chain.request());
return unzip(response);
}
// copied from okhttp3.internal.http.HttpEngine (because is private)
private Response unzip(final Response response) throws IOException {
if (response.body() == null)
{
return response;
}
//check if we have gzip response
String contentEncoding = response.headers().get("Content-Encoding");
//this is used to decompress gzipped responses
if (contentEncoding != null && contentEncoding.equals("gzip"))
{
Long contentLength = response.body().contentLength();
GzipSource responseBody = new GzipSource(response.body().source());
Headers strippedHeaders = response.headers().newBuilder().build();
return response.newBuilder().headers(strippedHeaders)
.body(new RealResponseBody(response.body().contentType().toString(), contentLength, Okio.buffer(responseBody)))
.build();
}
else
{
return response;
}
}
}Stack Overflow用户
发布于 2022-09-28 12:06:30
如果标头包含4.10.0，那么版本gzip已经可以自动完成了。
Stack Overflow用户
发布于 2022-10-04 10:04:02
因为okhttp不支持放气
在BridgeInterceptor.java或BridgeInterceptor.kt中
if (transparentGzip &&
"gzip".equals(networkResponse.header("Content-Encoding"), ignoreCase = true) &&
networkResponse.promisesBody()) {https://stackoverflow.com/questions/51901333
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