在JavaScript中发送multipart/mixed请求至Google Search Console报错求助

错误原因分析 #

你的批量请求触发400错误，核心问题在于：

• 子HTTP请求缺少必需的Host头，Google批量API要求每个子请求必须包含Host字段
• 使用\n作为行分隔符，不符合HTTP协议要求的\r\n（CRLF）规范
• 初始空行导致边界解析异常，子请求的HTTP结构不完整

修复后的代码 #

var xhr = new XMLHttpRequest();
xhr.open('POST', 'https://www.googleapis.com/batch/webmasters/v3');
xhr.setRequestHeader('Authorization', 'Bearer ' + access_token);
xhr.setRequestHeader('Content-Type', 'multipart/mixed; boundary=batch_foobarbaz');

// 用CRLF符合HTTP协议行结束规范
var crlf = '\r\n';
var data = [];       

// 第一个请求块
data.push('--batch_foobarbaz');
data.push('Content-Type: application/http');
data.push('Content-Transfer-Encoding: binary');
data.push(crlf);
data.push('GET /webmasters/v3/sites/' + siteAdress + ' HTTP/1.1');
data.push('Host: www.googleapis.com');
data.push(crlf);

// 第二个请求块
data.push('--batch_foobarbaz');           
data.push('Content-Type: application/http');
data.push('Content-Transfer-Encoding: binary');
data.push(crlf);
data.push('GET /webmasters/v3/sites/' + siteAdress2 + ' HTTP/1.1');
data.push('Host: www.googleapis.com');
data.push(crlf);

// 结束边界
data.push('--batch_foobarbaz--');

var payload = data.join(crlf);        
xhr.send(payload);

关键修复点说明 #

1. 替换行分隔符：用\r\n替代\n，严格遵循HTTP协议的行结束要求
2. 添加必需头信息：每个子请求明确指定HTTP/1.1版本和Host: www.googleapis.com头
3. 规范请求结构：移除初始空行，子请求头与空体之间用空行分隔，和官方示例结构对齐
4. 补充编码头：添加Content-Transfer-Encoding: binary，避免解析歧义

修复后请求内容示例 #

--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary

GET /webmasters/v3/sites/https%3A%2F%2Fdomain.pl%2F HTTP/1.1
Host: www.googleapis.com

--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary

GET /webmasters/v3/sites/https%3A%2F%2Fdomain.pl%2F HTTP/1.1
Host: www.googleapis.com

--batch_foobarbaz--

内容的提问来源于stack exchange，提问作者Anna Maj