Apache HTTP Client和Spring RestTemplate之间的区别

问题描述

我正在调用Google Translate API，一个通过Apache HTTP Client调用，一个通过Spring的RestTemplate调用，并返回不同的结果.两者都获取完全相同的URL:

I'm making a call to the Google Translate API, one via Apache HTTP Client and one via Spring's RestTemplate, and getting different results back. Both are GETing exactly the same URL:

我想将"Professeur desécoles"从法语翻译成英语.

I want to translate "Professeur des écoles" from French to English.

使用的URL是(为了便于阅读，分为两行):

The URL used is (split onto two lines for sake of readability):

private static String URL = "https://www.googleapis.com/language/translate/v2?
key=AIzaSyBNv1lOS...&source=fr&target=en&q=Professeur+des+%C3%A9coles";

Apache:

@Test
public void apache() throws IOException {
    String response = Request.Get(URL).execute().returnContent().asString();
    System.out.println(response);
}

正确返回:

{数据": {翻译":[{"translatedText":学校老师" }]}}

{ "data": { "translations": [ { "translatedText": "School teacher" } ] }}

@Test
public void spring() {
    RestTemplate template = new RestTemplate();
    String response = template.getForObject(URL, String.class);
    System.out.println(response);
}

返回(错误地):

{数据": {翻译":[{"translatedText":教授+ +％C3％A9coles" }]}}

{ "data": { "translations": [ { "translatedText": "Professor + of +% C3% A9coles" } ] }}

我在RestTemplate HTTP标头配置中缺少什么吗?

Am I missing something in RestTemplate HTTP header configuration?

推荐答案

方法将执行URL编码.

RestTemplate methods that accept a String URL perform URL encoding.

大概您已经提供了以下 String 作为第一个参数

Presumably you've provided the following String as the first argument

https://www.googleapis.com/language/translate/v2?key=MY_KEY&source=fr&target=en&q=Professeur+des+%C3%A9coles

必须对字符％进行编码.因此，您的 q 参数的值变为

The character % must be encoded. Your q parameter's value therefore becomes

Professeur%2Bdes%2B%25C3%25A9coles

如果您解码，等同于

Professeur+des+%C3%A9coles

Google的翻译服务不知道如何处理％C3％A9coles .

Google's translation services doesn't know what to do with %C3%A9coles.

根据文档建议

而不是使用接受 String URL的重载，而是自己构造一个URI并使用它.

instead of using overloads that accept a String URL, construct a URI yourself and use that.

Apache的 HttpComponents Fluent API 未指定行为，但似乎String值是按原样使用的.

Apache's HttpComponents Fluent API does not specify the behavior but it seems the String value is taken as is.

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