问题描述,如下图所示：
String requestBody = "{\"message\": \"I am very frustrated.\"}";
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
ArrayList<Charset> acceptCharset = new ArrayList<>();
acceptCharset.add(StandardCharsets.UTF_8);
headers.setAcceptCharset(acceptCharset);
log.info(headers.toString());
ResponseEntity<String> res = restTemplate.exchange("http://httpbin.org/post", HttpMethod.POST, new HttpEntity<>(requestBody, headers), String.class);
String httpbin = res.getBody();
log.info("httpbin result: " + httpbin);
返回结果：
-> {Accept-Charset=[utf-8]}
-> INFO httpbin result: {
"args": {},
"data": "{\"message\": \"I am very frustrated.\"}",
"files": {},
"form": {},
"headers": {
"Accept": "text/plain, application/json, application/*+json, */*",
"Accept-Charset": "big5, big5-hkscs, cesu-8, euc-jp, euc-kr, gb18030, gb2312, gbk, ibm-thai, ibm00858, ibm01140, ibm01141, ibm01142, ibm01143, ibm01144, ibm01145, ibm01146, ibm01147, ibm01148, ibm01149, ibm037, ibm1026, ibm1047, ibm273, ibm277, ibm278, ibm280, ibm284, ibm285, ibm290, ibm297, ibm420, ibm424, ibm437, ibm500, ibm775, ibm850, ibm852, ibm855, ibm857, ibm860, ibm861, ibm862, ibm863, ibm864, ibm865, ibm866, ibm868, ibm869, ibm870, ibm871, ibm918, iso-2022-cn, iso-2022-jp, iso-2022-jp-2, iso-2022-kr, iso-8859-1, iso-8859-13, iso-8859-15, iso-8859-2, iso-8859-3, iso-8859-4, iso-8859-5, iso-8859-6, iso-8859-7, iso-8859-8, iso-8859-9, jis_x0201, jis_x0212-1990, koi8-r, koi8-u, shift_jis, tis-620, us-ascii, utf-16, utf-16be, utf-16le, utf-32, utf-32be, utf-32le, utf-8, windows-1250, windows-1251, windows-1252, windows-1253, windows-1254, windows-1255, windows-1256, windows-1257, windows-1258, windows-31j, x-big5-hkscs-2001, x-big5-solaris, x-compound_text, x-euc-jp-linux, x-euc-tw, x-eucjp-open, x-ibm1006, x-ibm1025, x-ibm1046, x-ibm1097, x-ibm1098, x-ibm1112, x-ibm1122, x-ibm1123, x-ibm1124, x-ibm1166, x-ibm1364, x-ibm1381, x-ibm1383, x-ibm300, x-ibm33722, x-ibm737, x-ibm833, x-ibm834, x-ibm856, x-ibm874, x-ibm875, x-ibm921, x-ibm922, x-ibm930, x-ibm933, x-ibm935, x-ibm937, x-ibm939, x-ibm942, x-ibm942c, x-ibm943, x-ibm943c, x-ibm948, x-ibm949, x-ibm949c, x-ibm950, x-ibm964, x-ibm970, x-iscii91, x-iso-2022-cn-cns, x-iso-2022-cn-gb, x-iso-8859-11, x-jis0208, x-jisautodetect, x-johab, x-macarabic, x-maccentraleurope, x-maccroatian, x-maccyrillic, x-macdingbat, x-macgreek, x-machebrew, x-maciceland, x-macroman, x-macromania, x-macsymbol, x-macthai, x-macturkish, x-macukraine, x-ms932_0213, x-ms950-hkscs, x-ms950-hkscs-xp, x-mswin-936, x-pck, x-sjis_0213, x-utf-16le-bom, x-utf-32be-bom, x-utf-32le-bom, x-windows-50220, x-windows-50221, x-windows-874, x-windows-949, x-windows-950, x-windows-iso2022jp",
"Connection": "close",
"Content-Length": "36",
"Content-Type": "text/plain;charset=ISO-8859-1",
"Host": "httpbin.org",
"User-Agent": "Java/1.8.0_131"
},
"json": {
"message": "I am very frustrated."
},
"origin": "###.###.###.###",
"url": "http://httpbin.org/post"
}
这个问题主要是因为使用了默认RestTemplate的配置，并且传入了一个string类型的Body。这将会使用底层的StringHttpMessageConverter类，这个类的成员变量writeAcceptCharset 默认设置为true，这将会默认将大量的acceptCharset添加到header中。
亲测可采取如下解决方案——重新配置StringHttpMessageConverter，设置writeAcceptCharset 为false
RestTemplate restTemplate = new RestTemplate();
for (HttpMessageConverter converter : restTemplate.getMessageConverters) {
if (converter instanceof StringHttpMessageConverter) {
((StringHttpMessageConverter) converter).setWriteAcceptCharset(false);
}
}