英文:
In Golang http client, what does Host mean in MaxConnsPerHost and MaxIdleConnsPerHost?
问题
在GO HTTP包中的MaxConnsPerHost和MaxIdleConnsPerHost中，"Host"是一个域名（例如yahoo.com）还是一个IP地址？"Host"的实际含义将影响我对连接池的设置。
英文:
In MaxConnsPerHost and MaxIdleConnsPerHost in GO HTTP package, is "Host" a domain(i.e., yahoo.com) or an IP address? The actual meaning of "Host" will affect my settings for the connection pool.
答案1
得分: 1
主机是URL的以下部分：
http://THIS.IS.THE.HOST/path/to/endpoint
^^^^^^^^^^^^^^^^
URL中下划线部分是主机。主机可以是域名或IP地址，这取决于使用的URL。请注意，它不依赖于响应请求的服务器。
例如，在以下URL中：
http://127.0.0.1/api/list-all
主机是127.0.0.1。但在以下URL中：
http://example.com/api/list-all
主机是example.com。
如果你有两个配置如下的服务器：
┌───── HTTP Server 1 (10.20.30.40)
│ ├ www.foo.com (default)
│ └ www.bar.com
│
DNS Load ──────────┤
Balancer │
└───── HTTP Server 2 (11.22.33.44)
└ www.bar.com (default)
那么http://www.bar.com被认为是相同的主机，即使它由两个不同的IP地址提供服务（10.20.30.40和11.22.33.44 - 注意：DNS负载均衡器不处理HTTP请求，而是处理DNS请求，并将不同的IP地址发送给不同的客户端以进行负载均衡）。
然而，11.22.33.44和www.bar.com被认为是两个不同的主机，即使它们提供完全相同的内容。
类似地，www.foo.com、www.bar.com和10.20.30.40被认为是3个不同的主机，即使它们都由同一个服务器和同一个IP地址提供服务（如果www.bar.com的负载均衡器解析为10.20.30.40）。
英文:
The host is the following part of a URL:
http://THIS.IS.THE.HOST/path/to/endpoint
^^^^^^^^^^^^^^^^
The underlined part of the URL is the host. The host can either be a domain name or an IP address - it depends on the URL you use. Note that it does not depend on the server answering the request.
For example, in the following:
http://127.0.0.1/api/list-all
The host is 127.0.0.1. But in the following:
http://example.com/api/list-all
The host is example.com.
If you have two servers configured like the following:
┌───── HTTP Server 1 (10.20.30.40)
│ ├ www.foo.com (default)
│ └ www.bar.com
│
DNS Load ──────────┤
Balancer │
└───── HTTP Server 2 (11.22.33.44)
└ www.bar.com (default)
Then http://www.bar.com is considered the same host even though it is served by two different IP addresses (10.20.30.40 and 11.22.33.44 - note: DNS load balancers do not handle HTTP request instead it handles DNS requests and will send different IP addresses to different clients to load-balance)
However 11.22.33.44 and www.bar.com are considered two different hosts even though both serve the exact same content.
Similarly www.foo.com and www.bar.com and 10.20.30.40 are considered 3 different hosts even though they are all served by the same server and same IP address (if the load balancer for www.bar.com resolve to 10.20.30.40).
答案2
得分: 0
在http://www.example.com/abc/def中，“Host”是www.example.com。
主机可能对应多个IP地址。这是正常的。
英文:
“Host” in http://www.example.com/abc/def is www.example.com.
The host may correspond to multiple IP addresses. This is normal.
答案3
得分: 0
“主机”一词指的是请求URL的主机部分。该术语不指代主机解析到的IP地址。
英文:
The term “host” refers to the host part of the request URL. The term does not refer to the IP addresses that the host resolves to.
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