我知道默认情况下okhttp3库它会添加标头Accept-Encoding: gzip并自动为我们解码响应。
我正在处理的问题是只接受标头的主机，例如：Accept-Encoding: gzip, deflate如果我不添加deflate部分，它将失败。现在，当我手动将该标头添加到okhttp客户端时，该库不再为我进行解压缩。
我已经尝试了多种解决方案来获取响应并尝试手动解压缩，但我总是以例外告终，即java.util.zip.ZipException: Not in GZIP format，这是我到目前为止尝试过的：
//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，响应标头将始终返回Content-Encoding: gzip和Transfer-Encoding: chunked
还有一件事，我也尝试了本主题中的解决方案，但仍然失败了D/OkHttp: java.io.IOException: ID1ID2: actual 0x00003c68 != expected 0x00001f8b.
任何帮助将不胜感激。
经过 6 个小时的挖掘，我找到了正确的解决方案，像往常一样，它比我想象的要容易，所以我基本上试图解压缩一个没有压缩的页面，因为它失败了。现在，一旦我点击第二页(已压缩(，我就会得到一个压缩的响应，上面的代码应该在其中处理它。此外，如果有人想要解决方案，我使用了修改后的拦截器，就像本答案中的拦截器一样，因此您无需使用自定义函数来处理解压缩。
我修改了unzip方法，使 okhttpinterceptor适用于压缩和未压缩的响应：
OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder().addInterceptor(new UnzippingInterceptor());
OkHttpClient client = clientBuilder.build();
拦截器就像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;
}
}
}
如果您的标头包含gzip，版本4.10.0已经可以自动执行此操作
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()) {