HttpClient / HttpResponse

HttpResponse HttpClient.get(String url)
HttpResponse HttpClient.get(String url, Map<String,String> headers)

byte[] HttpClient.getBytes(String url)                          // 二进制 GET
byte[] HttpClient.getBytes(String url, Map<String,String> headers)

HttpResponse HttpClient.post(String url, String body)
HttpResponse HttpClient.post(String url, String body, Map<String,String> headers)
HttpResponse HttpClient.postJson(String url, String jsonBody)

HttpResponse HttpClient.put(String url, String body)
HttpResponse HttpClient.put(String url, String body, Map<String,String> headers)
HttpResponse HttpClient.delete(String url)
HttpResponse HttpClient.delete(String url, Map<String,String> headers)

HttpResponse HttpClient.request(String method, String url, String body, Map<String,String> headers)
HttpResponse HttpClient.request(String method, String url, String body, Map<String,String> headers,
                                int connectSec, int requestSec)

int     statusCode / getStatusCode()
String  body       / getBody()
Map<String, List<String>>  headers / getHeaders()
String  error      / getError()          // 非 null 表示网络层失败

boolean isOk()                           // 2xx
boolean isError()                        // 失败或 -1
String  header(String name)              // 大小写不敏感