我如何告诉Akka HTTP上的spray“假设application/json"？

Question

在spray-json服务器上使用Akka HTTP；当未提供请求时，我如何“假设请求为Content-type: application/json"？”

问题

curl localhost:12345/request -d'{"sample":"json"}'

不起作用除非我加上

-H "Content-type: application/json"

明文规定。

我为什么问

• 不适合在README.md上显示琥珀示例
• 调试时总是手动添加标头很烦人

Answer 1

您应该将API定义为只接受内容类型json，这就是它不接受其他内容类型的原因。

只做curl -XPOST -d 'content' URL就会将内容作为application/x-www-form-urlencoded (默认行为)发布。

参见--冗长的卷发文章，参见下面示例中的Content-Type

$ curl -XPOST -d '{"test" : "testValue"}' "https://jsonplaceholder.typicode.com/posts" -v
*   Trying 104.31.87.157...
* Connected to jsonplaceholder.typicode.com (104.31.87.157) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
* Server certificate: sni233425.cloudflaressl.com
* Server certificate: COMODO ECC Domain Validation Secure Server CA 2
* Server certificate: COMODO ECC Certification Authority
* Server certificate: AddTrust External CA Root
> POST /posts HTTP/1.1
> Host: jsonplaceholder.typicode.com
> User-Agent: curl/7.43.0
> Accept: */*
> Content-Length: 22
> Content-Type: application/x-www-form-urlencoded
> 
* upload completely sent off: 22 out of 22 bytes
< HTTP/1.1 201 Created
< Date: Sat, 18 Mar 2017 04:54:41 GMT
< Content-Type: application/json; charset=utf-8
< Content-Length: 51
< Connection: keep-alive
< Set-Cookie: __cfduid=d91d0ebbaa5f7b40a998d327ffce2b5671489812881; expires=Sun, 18-Mar-18 04:54:41 GMT; path=/; domain=.typicode.com; HttpOnly
< X-Powered-By: Express
< Vary: Origin, X-HTTP-Method-Override, Accept-Encoding
< Access-Control-Allow-Credentials: true
< Cache-Control: no-cache
< Pragma: no-cache
< Expires: -1
< X-Content-Type-Options: nosniff
< Etag: W/"33-cwlRczABGtsoiZUP8lw9WSIt684"
< Via: 1.1 vegur
< Server: cloudflare-nginx
< CF-RAY: 3415986bb9f50c35-SEA
< 
{
  "{\"test\" : \"testValue\"}": "",
  "id": 101
* Connection #0 to host jsonplaceholder.typicode.com left intact
}

您必须更改客户端头以匹配API服务器接受的内容。

$ curl -H "Content-type: application/json" -XPOST -d '{"test" : "testValue"}' "https://jsonplaceholder.typicode.com/posts" -v
*   Trying 104.31.87.157...
* Connected to jsonplaceholder.typicode.com (104.31.87.157) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
* Server certificate: sni233425.cloudflaressl.com
* Server certificate: COMODO ECC Domain Validation Secure Server CA 2
* Server certificate: COMODO ECC Certification Authority
* Server certificate: AddTrust External CA Root
> POST /posts HTTP/1.1
> Host: jsonplaceholder.typicode.com
> User-Agent: curl/7.43.0
> Accept: */*
> Content-type: application/json
> Content-Length: 22
> 
* upload completely sent off: 22 out of 22 bytes
< HTTP/1.1 201 Created
< Date: Sat, 18 Mar 2017 04:53:22 GMT
< Content-Type: application/json; charset=utf-8
< Content-Length: 38
< Connection: keep-alive
< Set-Cookie: __cfduid=d8e90de27fc1fa87fb42b763a4199ba7d1489812801; expires=Sun, 18-Mar-18 04:53:21 GMT; path=/; domain=.typicode.com; HttpOnly
< X-Powered-By: Express
< Vary: Origin, X-HTTP-Method-Override, Accept-Encoding
< Access-Control-Allow-Credentials: true
< Cache-Control: no-cache
< Pragma: no-cache
< Expires: -1
< X-Content-Type-Options: nosniff
< Etag: W/"26-Zx6VPi+rfbM5YFlBzT2pzGEHcgg"
< Via: 1.1 vegur
< Server: cloudflare-nginx
< CF-RAY: 3415967b2af12a19-SEA
< 
{
  "test": "testValue",
  "id": 101
* Connection #0 to host jsonplaceholder.typicode.com left intact
}

您可以更改服务器上的内容类型，并自行将收到的任何内容更改为JSON (这可能不是一个好主意)。